The 36-year-old is leaving Championship side Blackburn Rovers and could be done with the game as a player.
"The likelihood is I'll probably retire," he told talkSPORT.
"My contract has ended at Blackburn. I had a good few years there, I wasn't involved as much last season.
"I re-signed in November, so I was getting up to speed and by the time I did, the season had petered out. After last season because I wasn't involved in the first three or four months, I tried to get my head around if this could be it.
"But I went back to Blackburn for another six or seven months and then I thought, 'I feel good, I feel fit'.
"There comes a time when you have to make a decision. You've got to get enjoyment from football and if you're not playing, that's a big thing for me.
"I wasn't involved as much as I would have liked last season.
"If that's the way it's going to be going forward, I'll look at something new and call it a day because it's about playing and being involved on the Saturday after training all week.
"I was disappointed when I didn't play last season, which is life, you get on with it. I've got a decision to make in the next couple of weeks, but I'll probably retire."
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