London Welsh coach Lyn Jones thinks it could take until November for Gavin Henson to be firing on all cylinders after the controversial Wales centre joined the Premiership newcomers.
Wales centre Henson, 30, had been without a club since April, after being sacked by Cardiff Blues over his drunken behaviour on a flight returning from a game in Glasgow. The move is a gamble for the Exiles, who won an appeal to play in the Premiership next season less than two weeks ago.
"There's a good chance he'll never reach those heights (of his time at the Ospreys) again to be honest with you, but he just needs to get up to speed and establish himself and I'm not really confident he'll become a very, very good player until about maybe mid-October, November," Jones told Sky Sports.
"The guy needs a bit of time, he needs a bit of space, his tools are quite blunt and he'll need to sharpen them up, so he's got a lot of work ahead of him that he's prepared to get on with. He's rolling his sleeves up, and all you can do is offer people opportunities and it's up to them how they take it but we're confident that he can deliver."
London Welsh are Henson's fifth club in little over 18 months after being released by the Ospreys in 2010 and having short stints at Saracens, Toulon and the Blues.
His spell in France was also been marred by an alcohol-related incident, with the club suspending him for a week after a nightclub altercation with two team-mates.
During a period of unpaid leave from the Ospreys prior to his move to Saracens he also appeared on reality TV shows Strictly Come Dancing and 71 Degrees North, and last year featured on The Bachelor.
The Exiles have not disclosed the length of Henson's contract but he will train with his new team-mates on Wednesday.
London Welsh managing director and former Wales flanker John Taylor said: "He is the first to admit things have gone a little haywire over the last few years but he has impressed on me that he still feels he has a lot to prove as a rugby player and is determined to ensure he is not remembered as somebody who never fulfilled his great potential.
"I am confident he will fit in well here and it is obvious he cannot wait to get back to what he does best - playing rugby."