The talented 20-year-old attacking midfielder currently plays his football in Germany with Hamburg but both Chelsea and United are keen to do a deal in the summer.
Hamburg face a battle to keep hold of the player and will demand at least £10million if they are to sell, which would not be a problem for Europe’s big spenders.
United and Chelsea have had scouts watch the player, who has been compared to Cristiano Ronaldo, while Liverpool, Tottenham and Arsenal have also shown an interest.
A goal apiece from James Tomkins and Luka Milivojevic handed Crystal Palace a crucial 2-0 win over Huddersfield at the John Smith's Stadium on Saturday evening.
Manchester United bounced back from their Champions League exit as they beat Brighton 2-0 at Old Trafford on Saturday night to reach the FA Cup semi-finals.
Tottenham reached the FA Cup semi-finals after they cruised to a 3-0 victory over Swansea in their quarter-final clash at the Liberty Stadium on Saturday.
Premier League basement club West Brom squandered the lead as they suffered a 2-1 defeat to Bournemouth at the Vitality Stadium on Saturday.
Chesterfield boss Jack Lester felt his side were unlucky not to claim all three points after their 1-1 draw at Cheltenham.
New Swindon manager Phil Brown revelled in his side's victory at Cambridge in his first game in charge.