The Chelsea defender has quit Stamford Bridge after Allardyce convinced him he has a huge future at St James' Park.
Geremi Signs For The Toon
Although Geremi is out of contract, it is believed that United have paid him a signing-on fee of around £2m, and he has agreed a three-year deal after passing a medical at the club's Benton HQ.
The player broke off from his holiday in Africa to fly to Tyneside, and will be warmly welcomed by the Toon Army.
Geremi played for Middlesbrough four years ago, but I'm sure he has recovered from that experience.
Aussie striker Mark Viduka snubbed a new deal at Middlesbrough to join the Mags, and the ex-Smoggy duo link up with other new signings Joey Barton from Manchester City and Czech defender David Rozehnal.
Geremi has played in several different roles throughout his career at both international and club level and will provide Allardyce with options at both right-back and midfield.
Claudio Ranieri paid £7m for his services, when he was manager at Stamford Bridge.