He's certainly been a useful player in the past - over ?2m in transfer fees, but has had injury problems. Cardiff have Premiership aspirations, so he was put on their transfer list. He hasn't played first team football except for a spell at Walsall last season, which seemed to go well.
If he hasn't lost his speed and we can get him match fit quickly, he could be a useful League One player. If all goes well and his wages aren't a problem, I expect Ronnie might be thinking of signing him permanently in January transfer window.