The Bundesliga club signed the talented winger in a reported £5million deal from the Gunners on transfer deadline day.
Wili Lemke, a member of Bremen's supervisory board, is extremely pleased with the arrival of the 21-year-old at the club.
"I think it's really very clever and creative how Frank Baumann has gone about the deal," Lemke told Sport1.
"I think it's great how it's turned out.
"It's difficult for me to talk openly about it as I'm a member of the supervisory board and have to adhere to confidentiality."