The Blades have completed the signing of powerful striker Darius Henderson.

The Doncaster-born hitman put pen to paper on a four-year deal late on Tuesday afternoon. United have paid Watford £2m for his services, which could rise on criteria being met.

"I'm delighted to finally get Darius," said Kevin Blackwell. "I've tracked him for a while and he was number one in my mind to replace Rob Hulse. Darius knows what the Championship is about, he will fit straight into the Blades ethos."

Henderson, 26, has played a massive role in Watford's Championship and Premiership campaigns in recent seasons and lists Reading and Gillingham as his former clubs, as well as loan spells at Brighton and Swindon.

The Blades will be his first northern club and he said on Tuesday: "I was told a fee was agreed between the clubs and I was more than happy to come and speak to the manager. This is a great move for me, coming back home. I've met the lads and there is quality in abundance here."