Starting off strong here with the Polish goal machine. The 37-year-old has scored 17 goals this season. Low by his standards but still a healthy tally. Lewandowski would add great experience to this squad and could be tempted by a short-term stint in the Premier League. (Image: Alex Caparros/Getty Images) 1 of 10
Sticking with strikers, Vlahovic will leave Juventus at the end of this season. He scored six goals in 18 appearances at the beginning of the campaign but an abductor injury scuppered his momentum. He's a risk, but, at 26, Vlahovic still has his best years ahead of him. (Image: Loris Roselli/NurPhoto/Shutterstock) 2 of 10
The Welshman has enjoyed his best Premier League season to date and has been pivotal as Fulham look to gatecrash the race for Europe. Wilson is 29 now and United would be wary this campaign has been the exception, rather than the rule, for the ex-Liverpool man. (Image: Getty Images) 3 of 10
Goretzka has been integral to Bayern's success in recent years and would add plenty of experience to the United team. The 31-year-old will still feel he can offer something to the Reds but he has never played outside of Germany. That would be a concern. (Image: Harry Langer/DeFodi Images/DeFodi via Getty Images) 4 of 10