He's 29 years old, in good shape (looks as strong as an Ox, not the liverpool one though) and has plenty of time to get fully match fit, given that he's had an injury to recover from this season and last, its no surprise he's not fully up to speed.
I assumed in the summer that it would be Oct/ Nov before we saw him anywhere near sharp enough, so given that he's only just made a couple of brief cameos since his latest op i think that whatever we see this season is going to be a bonus. Get him a full preseason in the summer and he'll be firing for the start of next season.