Arsenal defender Laurent Koscielny has thrown down the gauntlet at teammate Alex Iwobi.
The Nigerian international has impressed under manager Unai Emery, scoring in a 3-2 defeat at Chelsea and taking on a leading role in a 4-2 win over Vorskla Poltava in the Europa League on Thursday.
"He has huge potential and he needs to realise how good he could become," Koscielny wrote in his programme notes ahead of Arsenal's 2-0 win over Everton.
“Right now, he is definitely on the right path to do just that. He is working hard at training and his confidence is high since Unai Emery arrived.
“If you look at him he has everything. He is strong physically, quick, good technically and his movement is good. He needs to be more efficient and clinical so he scores and assists more.
“He is very receptive and listen to advice so I have no doubt that he will continue his progression."