Mathers has what looked like a hamstring worry and IJ was warming up with the squad on Monday evening.
I would assume that if Mathers were going to miss out IJ would have come in at 6 and Sykes gone to FB, however after what i have seen and did see, Tony at FB keeping Sykes at 6 would have been a better shout.
That said IJ may have worked on his game and sooner or later he is going to have to be given a shirt before his contract expires, maybe he has done enough to impress Agar already???