The Blaugrana keeper has stated that he intends to leave the Catalan club at the end of this season.
After Forster produced a string of fine saves during Celtic's Champions League defeat to Barcelona on Tuesday, Alves has admitted that he is impressed with the Englishman.
"We have played Celtic three times in a year now and each time Forster has been fantastic," the Daily Record quotes Alves as saying.
"He has had to deal with the best attacking players in the world and each time he has done very well – even in the games Celtic lost. Barcelona are a club that are always looking to add quality and it's clear Forster has real quality.
"Obviously no transfers can be done at the moment – but if it is a deal that ever happens, then he would be a good addition."