By Rob Kelly
The Spanish defender has filled in at left back for Arsène Wenger's side in recent months in the absence of both Gibbs and Andre Santos.
"I know that I have had my chance because of injuries, and I am really happy [to have played]," he told Arsenal.com.
"The injured players were here at the start of the season and they will be back sooner or later, so I just have to fight for [my place] and make sure I am training as well as I can.
"[Gibbs and Sagna] have been part of the team for a long team and they are great players. Obviously with all the injuries that we have had, it is bad for us but [it has allowed] some players to show they are good enough to be in the first team.
"Now these players will have even more competition around them. They are big players for us, but we also have a lot of good players in the squad."Copyright 2016 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