At the start of the season, Oscar was playing really well and was giving no chance nor reason for Mourinho to play Mata. However, he has now had a big drop in quality (like many of our players) and Juan deserves a real chance, no doubt. However, we have way too many players in that position, so Mata wont have that much of a room to prove himself. I mean, he wont have 3-4 games to convince Jose, he will have 2 at the most... Personally, I would start him in both the West Ham and Steaua games, but if he doesnt respond well to it, then it is game over!