An NFL player who arrived woefully out of shape to begin pre-season training has cited 'injury of pregnancy' as the reason of his lack of fitness.

Buffalo Bills running back Karlos Williams has admitted over-indulging during his fiancée's pregnancy.

"I like to eat, and then her being pregnant gave me an excuse to eat, so eating anything and everything," Williams told ESPN at the team's mandatory minicamp on Wednesday.

"She'd wake up, one or two o'clock, 'I want a snack.' Well I'm not going to sit here and watch you eat because I don't want you to feel bad," Williams explained.


"But it's back to football. She's getting back to working out herself, so kind of motivating each other, feed of each other's energy, and we're ready for camp."

Coach Rex Ryan wasn't too impressed with the out of shape Williams and said he faces a battle to get fit before the pre-season begins in August.

"I don't think it's gonna be easy. I don't think that at all," Ryan said.

"Obviously, he's had some different things. I know some personal things, all that. But we do have to be slow with him."