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Bromby, who arrived on a three-and-a-half-year deal, has struggled to hold down a first-team place at Bramall Lane but recently regained his place in Bryan Robson's side.

However the Blades have agreed to let the 27-year-old join the promotion-chasing Hornets and will receive an initial £600,000, with a further £250,000 based on certain criteria.

Bromby's agent Ricky Hill said of the move: "Leigh is excited at the prospect of joining Watford and helping them in their bid to win promotion to the Premier League."

Eustace arrived on a two-and-a half year deal for an initial £250,000, which will rise to the full amount if Aidy Boothroyd guides the club back to the Premier League.

Eustace joined The Potters on a free transfer from Coventry in 2003 and went on to make 74 league appearances for the club.