The former Barcelona starlet has started 15 Premier League games this season.
De Gea is a doubt for United's final game of the season against Hull City.
Arsenal manager Arsene Wenger said he regrets not taking 3 points against Manchester United on Sunday (18 May), blaming the Gunners' slow start in the first half.
Valdes made his debut with Van Gaal's side during the 1-1 draw against Arsenal after De Gea suffered an injury.
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Manchester United are plotting a summer move for Thomas Muller after his bust up with Pep Guardiola.
Jose Mourinho has revealed that Nathan will be sent on loan in the summer.
Paul Pogba is said to be on Manchester United and Chelsea's summer shopping list.
Dybala has been relentlessly linked with clubs in England and France but will remain in Italy with Juventus.
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United are now all but certain to finish fourth after drawing at home.
The Catalan giants remain on course for the treble.
De Gea may have played in his last United game after picking up an injury against Arsenal.
Van Gaal insists the profile of a player is more important than his transfer fee.
IBTimes UK brings you live coverage as the old Premier League rivals meet at Old Trafford.
Ings all but certain to leave relegated Burnley this summer.
Robin van Persie has been a reported transfer target for Real Madrid as he has one year left on his contract.
Manchester United may have to sell David de Gea at a loss to Real Madrid.
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Santi Cazorla has revealed that he will not leave Arsenal in the summer.
Manchester United are considering signing AS Roma midfielders Miralem Pjanic and Radja Nainggolan.
Louis van Gaal wants Angel di Maria to change his behaviour to get back into the first team.
José Mourinho insists that without John Terry Chelsea would not be champions.
Liverpool are favourites to sign Asier Illaramendi from Real Madrid.
Jamie Carragher has urged Manchester United target Gareth Bale not to be a scapegoat at Real Madrid.
Louis van Gaal believes Arsenal have a better squad than Chelsea, but lack a winning mentality.