Real Madrid coach Jose Mourinho is wary of Champions League opponents Manchester City.
Mourinho has made a personal check on City and he admits they will pose them problems.
"I went over to see City play because I want my job to be done as close to perfection as possible. I wanted to analyse our opponents not just by video or stats but to see them first hand," Mourinho told the Sun on Sunday.
"Okay a match against QPR is not a good game to make a direct transfer to a match in the Bernabeu. But it was good enough to see some aspects of the City team.
"And what I do know is they have very good players - and are a powerful side."