Douglas Costa could leave Bayern Munich in the summer
Costa saw his game time limited under Bayern Munich boss Carlo Ancelotti this term as he was restricted to just 14 Bundesliga starts.
He has struggled to usurp Arjen Robben, Franck Ribery and Kingsley Coman and has been frequently used in a rotation system by the Italian tactician.
Jose Mourinho is eager to improve his midfield additions as he feels he needs more creativity and fluidity in his squad to turn his side into Premier League title contenders next term after being well off the pace this season.
How Man United could look next season after £200m summer spree Tue, May 9, 2017
Gary Neville believes Jose Mourinho will be handed a £200m transfer kitty this summer
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How could Jose Mourinho's side look next season?
Max Allegri is keen on Douglas Costa
Recent reports suggested Bayern could sell Costa, and that the 26-year-old would be open to a move should Manchester United qualify for the Champions League.
That objective was achieved last night in Stockholm, as the Red Devils beat Ajax 2-0 in the Europa League final.
And now according to Italian paper La Stampa, Juventus have stepped up their interest by making a bid for the 26-year-old.
It is said the recently crowned Serie A champions have tabled an offer of £21million.
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Juve and Bayern have a good working relationship after Arturo Vidal, Coman and Mehdi Benatia have all followed the same path from the Allianz Arena to Turin.
Tottenham have also been mooted as a possible destination for the Brazil international.