Brazil international Alves is considered one of the top right-backs in Europe, with Mourinho having problems in that position last season when he played midfielders such as Lassana Diarra and Geremi there at times.
"The only thing I know is that we want to make our squad even better," said Mourinho. "Right-back is a position we feel we can improve but to improve is not easy, you have to go for a good player and Alves is a good player."
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