It's probably about getting a sense of the club's plans for him.
In the last few years he's been moved all over the pitch, put in the side when clearly injured (he probably was up for playing but in retrospect it was a very bad decision), then dropped for the biggest game of the year. My guess is that, with a couple of years left on his contract, he wants to clarify whether the club sees him as its talismanic number ten, who to an extent the side is built around, or not.
If not, from his POV, at 27, he entirely reasonably needs to look at his options; and from the club's POV, his salary is probably not something they can justify going into the next round of negotiations.
That's my guess, anyway. And it all seems pretty reasonable. It may be something else - maybe he feels jaded and wants a new challenge, maybe Stretford is telling him he deserves eight million quid a week. But from the little we know, that's what seems likely.