11 It would not be hyperbole to suggest that 19-year-old Pulisic is already one of the best players ever to come out of America, and will almost certainly become by far the best by the end of his career.Dortmund’s youngest ever Champions League player when he appeared against Legia Warsaw as a sprightly 17-year-old, Pulisic has already made 97 appearances for the German club.His already impressive experience includes 21 European appearances and the same number of games in a national team shirt, with nine goals for his country.Bayern Munich, naturally, are circling as they look to lock up yet another Dortmund talent, and are rumoured to be considering a £60m bid. Willian appears to have few options left after United were ruled out and other suitors Barcelona splashed £37m on Malcom Fekir was reportedly hours from completing a move to Liverpool but his club Lyon cancelled the deal following the Reds’ medical concerns 11 While exuberant youngsters have not always faired well under Mourinho, who tends to place his trust in experience, Bailey could be the breath of fresh air required to challenge cross-town rivals City.United particularly lack left-footed players and Bailey would fit that bill, able to play on either flank and whip crosses in for the waiting Romelu Lukaku.The German FA are monitoring Bailey’s progress as he stalls over committing to the Jamaican national team, citing concerns over his homeland FA’s institutional structure.With four years remaining on his Leverkusen contract, the German side are under no pressure to sell, but a substantial bid from United could very quickly alter their stance.3. NABIL FEKIR, Lyon 11 11 Dembele has been cast out at Barcelona despite being just 12 months removed from the £135m deal that brought him to the Nou Camp 11 Pulisic spent a brief period in Brackley Town’s youth team when he was seven Rebic was man of the match as Eintracht Frankfurt beat Bayern Munich 3-1 to win last season’s German Cup Another electric young winger who made his breakthrough in the Bundesliga, Bailey has drawn interest from multiple Premier League clubs.Arsenal, Chelsea and Tottenham have all been linked to the 20-year-old, who was born in the Jamaican capital Kingston.His frightening close control makes him a similar option to Dembele, but he would likely cost far less than the Frenchman.He could still command a £40m fee however, with his price tag being driven up by the number of clubs in for him. Bailey, 20, signed for Leverkusen from Genk in January 2017 in an £18m deal The Jamaican-born winger scored 12 goals for Leverkusen last season Rebic was a key figure as Croatia finished as runners-up in this year’s World Cup 11 11 11 11 Manchester United boss Jose Mourinho is desperate to add depth on the Old Trafford flanks this summer, but time is rapidly running out to secure new signings.After Chelsea blocked any potential move for Willian by declaring their intention not to sell to a Premier League rival, United find themselves with just over two weeks to add to a worrying lack of options on the wing. 11 Dembele won the World Cup with France this summer, making four appearances in Russia for Les Bleus A year on from his £135million move from Borussia Dortmund, 21-year-old Frenchman Dembele could already be on his way out of the Nou Camp.One of the most wanted players in Europe last summer, Dembele was cruelly struck by two long-term injuries in his debut Barca season.Bizarrely, given his quality as one of the best one-on-one dribblers around and ability to play with both feet, the club seem to have given up on the World Cup winner already.Barcelona splashed out £141m on Philippe Coutinho in January and then snatched Malcom from Roma in a £37m deal this week, likely signalling the end for Dembele. The 25-year-old offers perhaps the closest technical style to Willian on this list, albeit left-footed.Able to dribble, score and create while cutting in from the right, Lyon captain Fekir would be the perfect upgrade on Juan Mata, able to cover in more central areas if needed.He hit 18 goals in Ligue 1 last season, nearly doubling his career total, and if he can keep up this form he could solve another United issue – goals from midfield.Forwards Lukaku, Martial, Lingard and Rashford contributed 64 goals last season but there was a distinct lack of support from elsewhere, something Fekir could change.4. CHRISTIAN PULISIC, Borussia Dortmund 11 Among the current crop of talent at the club, Anthony Martial looks set to depart for either Juventus, Tottenham or Chelsea.Alexis Sanchez is approaching the wrong side of 30 and English pair Jesse Lingard and Marcus Rashford are far more comfortable in central roles.Age – and a string of failed attempted replacements – has consigned former flyer Ashley Young to a permanent role at left-back, joining new club captain Antonio Valencia as a converted winger.With Willian off the table and the window set to slam shut early this year, talkSPORT look at five alternatives to the Brazilian that Mourinho can now turn his focus to.1. OUSMANE DEMBELE, Barcelona Still a fearsome talent regardless, Dembele could be available for a bargain fee this year as his club look to cut their losses on him.His ability to run at players is something United crucially lack, and he would offer a genuine threat with both goals and assists.The former Rennes man already has 16 international caps under his belt, keeping the likes of Thomas Lemar, Kingsley Coman and United’s own Anthony Martial out of the Les Bleus lineup.And if Barca do decide to let him leave this summer, United will be joined by a long line of clubs queueing up to secure his signature.2. LEON BAILEY, Bayer Leverkusen But the hordes of talent on Munich’s wings, including Arjen Robben, Franck Ribery, Coman, Alphonso Davies and Serge Gnabry, mean United could offer first-team chances their Bundesliga counterparts cannot.From a cynical marketing point of view, Pulisic would also give United a significant foothold in the US, where his influence and reputation should not be underestimated.And the player – still so young he was denied the man of the match award against Liverpool in a recent friendly because it was sponsored by Budweiser – is worth the hype.Former Dortmund boss Jurgen Klopp has been glowing in his adulation of Pulisic, and with Real Madrid also interested, United would need to act fact to sign him.5. ANTE REBIC, Eintracht Frankfurt Fekir’s partnership with United flop Memphis Depay provided a combined 37 league goals Rebic, 24, was one of the more unsung stars of Croatia’s run to a first-ever World Cup final.Tormenting defences with partner-in-crime Ivan Perisic, also a reported United target, Rebic started all but one of his country’s games in Russia, missing only the group stage dead rubber against Iceland.His stunning – if fortuitous – volley against Argentina set Croatia on their way to an extraordinary 3-0 win, while he ran England’s full-backs ragged in the extra-time semi-final triump.While some concerns were raised over the statistic ranking him at the top of the fouls committed charts at the World Cup, he did play the 12th-most minutes of any player at the tournament. Pulisic scored 49 goals in 64 appearances for the United States’ youth teams before getting a first senior call-up in 2016 This deal, first and foremost, would be a hit with United fans purely due to the annoyance it would cause fierce rivals Liverpool.Fekir was all set for a £53m switch to Merseyside this summer but the club hesitated over his medical past, which includes a long-term knee injury.Lyon president Jean-Michel Aulas pulled the plug on the deal rather than wait for Liverpool to make up their minds, leaving the player in limbo having reportedly already selected his shirt number at Anfield.Aulas, renowned for operating somewhat beyond the pale in negotiations, could prove a stumbling block for United, but the prize would be worth the toil. Rebic is now being linked with a £44m move to United from current club Eintracht Frankfurt, where he has also drawn the attention of Bayern.His direct style and ability to run all day will suit Mourinho down to the ground, while his age makes him the more favourable option to Perisic, whose £48m price tag appears steep at 29 years old.With the summer transfer window now just 16 days from closing, United must make their decision quickly.Mourinho is growing worried about the number of key players missing from his squad for the opener against Leicester City on August 10, and a new signing may be the best remedy to improve the mood around the club.