The England and Everton left back had joined up with England in the hope of playing against both Slovenia this evening and Scotland on Tuesday. Now, that possibility is over as he withdrew from the international set up early on Thursday morning.
Up to now the extent of the injury was unknown, with England boss Roy Hodgson saying:
"Leighton felt something in his hamstring, so he stopped immediately, but I couldn't tell you the extent of it.
"He will go back to his club. Its a real blow, as it came about when we were being really cautious with Leighton.
"He didn't train Monday or Tuesday and he did very little yesterday, and today the session had barely got going before he felt it. A fatigue that has been there lying dormant, but made itself apart."
Baines returned to Finch Farm on Thursday afternoon and immediately had scans on the injury.
The results of those scans arrived back at Everton today and thankfully show that the injury isn't as serious as it might have been and Baines will only be looking at 1-2 weeks on the sidelines.
It appears to be a very similar injury to that of James McCarthy and both could be a possibility for West Ham on the 22nd November or Wolfsburg on the 27th.