I'm not opposed to the idea of selling if we get a good offer (10 mil or more) and have a good replacement lined up, but in no other circumstance. He's been important to the team since he arrived and he will be needed at worst for rotation's sake, purely due to the amount of fixtures we have due to the CL / EL. There's also the fact that he fits very well in a 4-3-3 or 4-5-1, being able to play both in the central position and on the left wing(which is where I've always felt he's been best).
Regardless, I doubt he's leaving, as he's getting older, is as injury-prone as ever and is too valuable to the club to be sold at a low price. Basically, I don't think any team that could afford him needs him badly enough to pay the price we'd demand. Then again, Matri for 11 mil happened
