Sheffield United have completed the signing of Watford midfielder Lee Williamson for an undisclosed fee.
Williamson has agreed a three-year contract after passing a medical on Thursday morning to become the Blades' first summer signing.
Blades manager Kevin Blackwell told BBC Radio Sheffield: "Williamson has got great athletic ability to get from box to box.
"Once we knew we could get him we were delighted to sign him."
The 27-year-old moved to Watford from Rotherham in January 2007 as part of a joint switch with striker Will Hoskins.
Williamson has made 78 appearances for the Hornets, including 38 last season, and has scored five goals for the club.
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