The Uruguay midfielder was one of the last players to begin his pre-season preparations after helping his country reach the quarter-finals of the World Cup.
He came off the bench against Manchester City last weekend and since then has continued to build up his sharpness in training.
“Yes, he is okay every day and is training good,” said Unai Emery. “He is now with the team and knowing and learning English conversation with us and can understand all the things we want to do tactically on the pitch.
“He is okay, the first match against City he played 15 to 20 minutes and I think this is good, I want to continue with him improving and to be okay to play.