Saul Niguez will cost Manchester United not more than £43 million.
The Red Devils are said to be the only club interested in signing the Atletico Madrid midfielder, but they are not willing to spend a fortune to do so.
Barcelona is keen to sign Ilaix Moriba, a young midfielder, to a new contract.
The 18-year-old is nearing the end of his current contract, which has seen him linked with Manchester United and RB Leipzig.
Barca wants Moriba to sign a contract extension to fend off prospective suitors, and he is delighted to commit his long-term future to the club after a promising start.
Manchester United's Eric Bailly is expected to turn down a contract extension.
The Ivorian defender was irritated after being left out of the Red Devils' Europa League round of 16 tie against Milan on Thursday.
That snub was the final straw for Bailly, who has been reduced to a bit-part role this season under Ole Gunnar Solskjaer and has only a year left on his current contract.
Julian Brandt will be allowed to leave Borussia Dortmund this summer.
If a bid of around €25 million is made, the German giants are willing to sanction the 24-year-departure.
Brandt, who has previously been linked with Arsenal, has only scored two goals in Dortmund's 24 Bundesliga appearances this season.
Manchester City are on the lookout for a new left back this summer.
They have a long list of options, including Nuno Mendes [Sporting], who is a difficult one because he has a €70 million release clause that Man City will not meet. Many clubs are competing.
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