Sir Alex Ferguson is convinced Robin van Persie will prove to be the last piece in his Manchester United jigsaw.

It may only be just over four months since the striker arrived from Arsenal in a £24million transfer but in Ferguson's mind, that fee - large for a player entering the final year of his contract - has already been justified thanks to a combination of Van Persie's 15 goals and a growing number of assists that have helped United celebrate Christmas Day on top of the Premier League.

"I reckon we got our Christmas present early - right at the start of the season when Robin van Persie arrived at Old Trafford," Ferguson told United Review.

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