The Geordie is being linked with Barca as a replacement for Victor Valdes.
"We have played Celtic three times in a year now and each time Forster has been fantastic," Alves told the Daily Record.
"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'd be a good addition."
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