Arsenal manager Arsène Wenger commented upon Lucas Perez's and Shkodran Mustafi's impact on the squad:
“They have settled very quickly and very well, so the real test is the games. We will see and know very soon, but what they do in training is promising. A least they have the quality and focus in training that we expected and on that front I’m very happy.
We did the deals quite early, compared to some other clubs, because we finished our job on Saturday and the transfer deadline was on Wednesday. It was earlier than expected, because it was a quick turnaround on Saturday morning which we didn’t expect to go so quickly.
They bring us qualities. Mustafi is a young centre-back, and has already got international experience. Lucas is an interesting striker, who is versatile, can play on the flank and especially though the middle. He can score goals and can also provide a good number of assists. With the way I like to play, that’s an interesting quality. I would say it’s the most mature squad I’ve had for a long time, because they are men. They are not 19 or 20 years old, they are 24, 27, 28 and the whole squad is quite mature.
It’s the first time for a long time that I’ve had a team of what you can call men ready to compete. After, we have to show that we are good enough to beat everybody else. I always believe we have a chance, even when we had young players. Certainly I haven’t had a squad of players [like this] for a long time, who have enough experience to compete".
Source: transfermarketweb.com