Bale has been linked with Barca in recent weeks.
And Alves told the Guardian: "Take Gareth Bale, a player I love.
"He's a full-back in the Brazilian mould, he has a similar idea. In Europe [Spurs] play him as a winger, but in my team he'd always be a full-back. People get scared and play attacking full-backs as wingers. They think they will attack more, but often they attack less and less well. It happened with Roberto Carlos: as a winger, he was less effective, he needs to start his run sooner. Bale is more skilful and good as a winger, but at Barcelona he would be a full-back."