Players who join clubs on free transfers and go on to be successful is something of a rare sight in the Premier League these days, as we now usually see the players signing for big fees being the ones who get all the limelight.

But Mohamed Diame's outstanding  game-changing substitute appearance in West Ham's 3-1 win over Chelsea at the weekend got me thinking of the most successful free transfers we have seen in the Premier League.

The only player to feature twice is Brad Friedel, because it still amazes me how the consistent American stopper hasn't been the subject of a huge transfer fee throughout his career.

Click on Jay-Jay 'so good they named him twice' Okocha to see the 15 most successful free transfers in Premier League history