The Spain international suffered a torn hamstring in the 1-1 draw with Valencia in early February.
Roura revealed that the 33-year-old, who has been left out of the squad for Saturday's clash with Granada, took part in Friday's training session, but insisted that he is still not fully fit.
"Xavi ready for Milan? He rejoined training, did almost all the exercises, but we have to wait and see a few days to see how he reacts," Roura told a press conference.
Xavi has made 661 appearances for Barcelona so far in his career.