After his failure to live up to expectations in his debut season at White Hart Lane, it has been speculated the midfielder faces an uncertain future in the capital.
The big money summer capture from Blackburn was expected to be a big success in North London, having established himself as a key player at Ewood Park and broken into the England squad.
It has not worked out that way though, as Bentley has struggled to capture anything like his best form under first Juande Ramos - who signed him - and now Redknapp, who has preferred in-form Aaron Lennon down his right flank.
Redknapp acknowledges Bentley's frustration at playing second fiddle and accepts his current predicament could entice interest from elsewhere.
"Teams know what he can do and it is a possibility," he said.
FrustratingLuka Modric has also impressed on the left so Bentley will probably be on the bench this weekend when he returns to Blackburn, who he left last summer.
Redknapp added: "It's hard for David. Aaron has been in great form. You hope that Aaron keeps playing well and the team keeps winning and I don't have to change it, I've got to be truthful.
"Modric has played fantastic for me on the left. I certainly wouldn't be leaving Luka out of my team, that is for sure.
"It's difficult but it is a nice problem when the team is playing so well and winning. I couldn't even contemplate changing it."