Arsène Wenger says Arsenal are working hard to bring in "one or two players" before the transfer window closes.
Both players are expected to miss three months and Wenger, who was already on the lookout for potential signings, wants to reinforce his squad.
"Yes we are more [in the market now]," he told Arsenal.com.
"We have Chambers and we have Bellerin, who is coming on well, and I want to give them a chance as well, but of course we are in the market like many other clubs.
"We work really hard morning until late night to try to get one or two players in."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