Arda Guler has been linked with a move to another team, even last summer there were several teams that were ready to give him playing time if he wanted to move, but instead he preferred to stay in Madrid and try to get a place in the Madrid squad, even at that time Ancelotti also said that he would give enough playing time to Arda Guller and that's why he is quite confident in staying in Madrid although he musy to compete with many star players, I don't know at the moment what triggered his desire to leave, but it seems if he is starting to get disappointed with what Ancelotti promised previously.
Turkish fans are not happy concerning the limited time Arda Guler feature in Real Madrid games. The player is highly regarded in the Turkish national teams and deserve to play consistently. But the quality of players in Real Madrid had made the young star have limited slot in Spain. Real Madrid see Arda as one of the future stars of the club and will not be willing to let him leave even on loan. Carlo Ancelotti will continue to use him as substitute until he becomes mature to play consistently.
In my opinion, the Real Madrid coach does not like to make radical changes to the team. He signed Arda as a future replacement. Something like: when a good Real Madrid player retires or changes teams, then Arda will be placed in the position of the player who left the team.
In my opinion, the Real Madrid coach follows the following ideology: "first come, first served", that is, the old players have priority. He knows that Real Madrid has players who may not be in the team in the next seasons, so Arda will replace these players. Arda has to continue to be patient.