Manchester United boss Sir Alex Ferguson concedes he struggles when shopping for goalkeepers.

But he has vowed not to repeat the mistakes he made in finding a replacement for Peter Schmeichel after confirming that Manchester United's veteran goalkeeper Edwin van der Sar is set to quit at the end of the season.

From the calamitous Massimo Taibi to the erratic Fabien Barthez, United went through no fewer than 10 keepers before eventually finding a safe pair of hands in the Dutchman.

Ferguson said: "I should have signed Van der Sar after Schmeichel. I made a mistake but now we think we know where we're going. Schmeichel and Van der Sar have been magnificent for us. I've been very lucky to have had them both."

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