By Rob Kelly
The experienced right back fractured his fibula against Tottenham in October and has been sidelined for the past four months.
Sagna could make the squad for Sunday's FA Cup tie against Aston Villa and Walcott cannot wait to resume their partnership.
“Bac shows good qualities at right back," he told Arsenal.com.
"We have had players come in and do fairly well considering they are not full backs but Bac is a player I bond very well with on the pitch.
"We work very well together and get on great. It's nice to see him back, because that memory of Tottenham when he broke is leg is not nice.
“It's good to see him smiling again and enjoying training. He is a player that I think we have missed.”Copyright 2017 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source