"mammoth effort" ?
He played 45 mins, he's a striker, his job is to put the ball in the net. Just because he put the ball in the net twice does that automaticly mean he's now more tired than he would have been if he missed those chances and still ran about the same?
I'd concider the average Joe working 9 till 5 every day putting their hands in shit and muck and still getting up the next day to do the same for peanuts, more of an effort than a guy who got paid £250k this week to kick a ball of wind around for 45mins.
Running himself into the ground
He's been sat on the bench most games, he's fresh (or should be) and as said should be starting against PSG and West Ham.