Kabba, 28 was signed by United manager Neil Warnock in November 2002 in a £250,000 deal from Crystal Palace after he gave an impressive display against the Blades whilst on loan to Grimsby Town which following his substitution during that game was handed an unexpected standing ovation by the home crowed.
During his first (2002/03) season with the Blades he helped them reach the Semi-Final of the FA Cup, scoring a unforgettable goal against Leeds United at the Quarter-Finals stage at the Lane. He also took part in the play-offs against Nottingham Forest - netting the leveller to make it 2-2 at the Lane after being 2-0 down.
He had scored on his debut, a 5-0 win against Bradford City at Valley Parade, he played along side Dean Windass who was on loan from Middlesbrough - he too scored on his debut against the Bantams.
However injuries dented his time in Sheffield and was virtually absent during the 2004/05 season despite scoring twice against Crewe Alexandra (4-0). he played a huge part in the Blades promotion season but eventually drifted out of the squad in the top flight and in January 2007 was sold to Watford for £500,000.
During his time in S2 he played 54 (+34) appearances and scored 23 goals.
His time at the Hornets wasn't bright and he made just 29 appearances in his two years with the club; he was sent on loan to Blackpool where he scored in a 3-1 defeat to Sheffield United whilst he also featured seven time on loan at Oldham Athletic.