Already proved himself as a good striker, his work is done. Now that enough people rate him he will just wait till the summer and see what club offers him the highest wage package.
He may be feeling the strain of his first full season in English football. Before this season started he had only made 2 appearances for Udinese and before that was a youngster at Banik Ostrava. He's still only 20.
Also, maybe more attention from defenders too. Fair comments really. I had no idea how young he was either !!
I dont buy the ' he's young and tired ' views TBH. At 20 most sportsmen are at their physical peak in terms of fitness/stamina. Also, he has been part of Zola's squad rotation system where he's been on the bench countless times.
Biologically he might be at a sexual peak at that age but as a sportsman, in particular a footballer, he will not fully mature until he is 24-26. And as for that howler of a 'pass' to Deeney, or rather the corner flag, is that not tiredness - mentally at least? Chalobah is suffering too, at 18, and it is hardly surprising. Victims of their own success I'd say.