The Gunners put five goals past Championship outfit Forest on Tuesday evening to book their place in the fourth round of the competition.
Striker Martinelli scored a brace, while Reiss Nelson, Joe Willock and the returning Rob Holding also got on the scoresheet in a convincing 5-0 thrashing.
We were waiting and watching him, how he could improve with us. He was working in each training session with a big spirit and performance.
I spoke with him before and told him to have some patience, to wait for his opportunities. Tonight he did that. He deserved his goals.
He is very humble, he fights, hes hungry to have that opportunity to help us.
Chambers, who spent last season on loan at Fulham, also impressed for Arsenal in his fourth appearance of the season.
Emery added: He helps us in training and in the dressing room. If you want him to play right-back, centre-back, left-back… he can do it.Read More – Source