Arda Guler has been expected to be in Real Madrid squad for the Mallorca game so far and I hope this doesn't change again. This is a game he can finally have a chance in for the first time. Ancelotti would keep him on the bench until securing the win by a decent score. After that maybe for 10 minutes or less we might see him on the pitch.
I don't think he has had his time with injuries completely. Real Madrid must have been working on his physique to be better on one hand. He has a good talent but as long as we don't see him on the pitch it doesn't matter unfortunately.

I think everyone is looking forward to the Turkish boy debut, and I'm very curious about his skills. Hopefully the match will be easy, I mean Madrid can score quickly and give Ancelotti the opportunity to rotate players, so Guler has the potential to get playing minutes from Ancelotti.
While strengthening the Fenerbahche first team for two seasons, Guler was indeed a key player at his old club, but in Madrid the competition for his position was very tight. Considering that he is still very young, his prospects of becoming a regular player in the future are very open, Guler only problem is injury.
Furthermore, if Madrid is able to create a point difference with closest competitor Girona, then Ancelotti will have the opportunity to rotate players more, including giving more playing minutes to two veteran players Modric and Kroos.