Tiago's main problem been mentality and attitude (he really is too soft and lacks grinta), even if didnt have the necessary qualities for CM in 4-4-2 (doesnt offer enough offensively to warrant his place, and is fragile defensively). But 3 man midfield has been the kind of midfield system he has done well in before, with Benfica, Chelsea and Lyon. So he should do better.
And he maybe stays because Ciro might think he is a good option, but bet your ass on that he is defenitely mainly staying because we cant get any good offers. While we can with Poulsen.