Watford have secured Academy goalkeeper Jack Bonham on a long-term professional contract after the shot-stopper celebrated his 17th birthday last week.
Ireland u17 youth international Bonham, will be contracted to the Hornets until 2013.
Watford manager Malky Mackay said: “We're delighted to have him on board; he's a good prospect and we see potential there.
“Jack has now committed himself to the football club and, under Alec Chamberlain's mentoring, we hope to see him progress and go from strength to strength.”
Sheffield United have signed Watford & Ireland U21 midfielder John Joe O'Toole on loan for the rest of the season.
The 20-year-old, who has scored eight goals this season, could make his debut in Sunday's clash with Birmingham.
O'Toole said: "I'm just delighted to come up here. I jumped at the opportunity."
"I just want to do my best here and hopefully put a few in the net and see what happens," added the Ireland Under-21 international.
O'Toole was rumoured to be a January transfer window target for Championship leaders Wolves prior to Christmas.
But he has fallen out of favour at Vicarage Road, having not started a league game for Watford since being substituted at half time in the 4-2 home defeat to Bristol City on Boxing Day.
He will not be available for the Blades' FA Cup fifth round replay against Hull City on Thursday night as he is cup tied
