Robson says he has yet to reach his peak as a player

Speaking after sealing his switch from Dundee United, the midfielder said he aimed to force his way into manager Gordon Strachan's first-team.

"Celtic says it all, the size of the club, the competitions you are playing in. I just want to be part of it," the 29-year-old said.

"I feel as though my best years are ahead of me."

Robson, who is cup-tied and will miss making his debut against Kilmarnock in the Scottish Cup on Saturday, has signed a contract until 2011.

"I feel as though my best years are ahead of me, every pre-season I come back feeling fitter and stronger," he said.

"I am looking forward to the next three-and-a-half years - I feel my body is getting stronger as I go along."

Robson said he hoped his versatility would help him to force his way into the first-team.

"I think I can play centre, left or right, I'm comfortable playing any of them," he said.

"If I get the chance and do the business, I will stay in the side, it is the same at any club.

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"But I am under no illusions, I know how good Aiden McGeady, Shunsuke Nakamura, Paul Hartley, Scott Brown are from playing against them."

The former Rangers player - who scored 12 goals for United this season - had also been the subject of a similar bid from Nottingham Forest this week.

But the midfielder, who began his career at Ibrox before moving to Inverness Caledonian Thistle, opted to join Celtic.