Manchester United manager Louis van Gaal has refused to rule out the possibility of signing goalkeeper Victor Valdes.
Manchester City boss Manuel Pellegrini says he is confident that England goalkeeper Joe Hart will sign a new contract.
Brest have sacked coach Landry Chauvin.
The Brittany club have slipped into the Ligue 1 relegation zone after just one win, and six points, in their last 10 games. They are currently two points adrift of safety with eight games remaining.
A statement on the club's official website this morning read: "Stade Brestois recognise a series of bad results which have put the club's Ligue 1 survival in peril.
"This situation has led Michel Guyot, president of Stade Brestois, after consultation with the principal directors, to separate from coach Landry Chauvin.
"The club's directors will advise very soon on the appointment of a new coach."