Arsenal have now signed six players this transfer window with Perez and Mustafi joining Granit Xhaka, and the young trio of Rob Holding, Takuma Asano and Kelechi Nwakali.
“He’s not only a goalscorer, he’s a guy who combines well with partners, who can give a final ball and makes good runs,” said Wenger of Perez.
“He’s got a good eye for goal and had an outstanding season last year.”
Speaking about Mustafi, Wenger added: “He is at the right age. He has good experience. He is a very focused player who can play with the ball as well. We have taken a great player but have prepared well for the future.”
Meanwhile, Werder Bremen are hopeful of signing Arsenal midfielder Serge Gnabry and say the transfer could be confirmed on Wednesday morning.