Leeds United take on Derby County later this evening.
Mowatt has been nursing a knock in training, and Evans has urged caution with the youngster.
The 53-year-old boss believes that if he picks the midfielder against Derby, it will do Mowatt more harm than good.
“Alex has been training, feeling a bit sore and then feeling okay the next day,” Evans revealed.
“If we allow that to continue then he knows and I know what’ll happen – he’ll pull his groin and be out for eight weeks. If we give him 10 days then it should be fine.”
Mowatt’s absence for Leeds will be a blow, as he has been in good form since Evans took charge.
The 20-year-old has netted twice in his last seven appearances, and has highlighted the creativity that he possesses.
Without injury, Mowatt would likely have featured against Derby - but Leeds will have to make do without the talented academy graduate later this evening.
That makes their task of beating an in-from Derby side look even tougher, but Leeds have picked up some encouraging results recently.
Leeds have taken 19 points from their last 12 matches, but this evening’s match against promotion-chasing Derby looks is arguably their biggest test since Evans took charge.