The Foxes travel to Vicarage Road in this play-off second leg.
Where: Vicarage Road
When: 12.30 BST
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Watford have striker Troy Deeney available again after he missed the 1-0 defeat in the first leg while he served a suspension.
Manuel Almunia should keep his place in goal after recovering from a hamstring injury to start on Thursday.
Leicester boss Nigel Pearson can keep the same starting 11 from the first leg if he chooses.
But he has the option of recalling Paul Konchesky, who was on the bench on Thursday after a hernia operation.
Hornets striker Alex Geijo, one of their large contingent on loan from Udinese, thinks they can overturn the first-leg deficit.
“It wasn’t the best result because we lost, but it’s only 1-0. We need to win at home, and why can’t we?” the 30-year-old Spaniard said. “We’re in the play-offs and have an opportunity to arrive at Wembley, and I think it’s a dream.
“We can’t be down in our mentality, we must stand up. Sunday is a final for us.”
Leicester striker David Nugent, who scored the goal at the King Power Stadium, is looking forward to facing the Hornets again.
“I’ve got a good record against Watford, particularly down there, so I hope it can carry on,” he said. “They seem to be a team that I always score against, so I’m quite pleased that we’ve got Watford in the next game.
“I’ve scored there for Preston, I’ve scored there for Portsmouth and I’ve scored there for Leicester in the last few seasons so hopefully I can carry it on and that will be the case again on Sunday.”
Foxes boss Nigel Pearson said: “Normally with him when he gets one goal he goes on to get two, three or four. He tends to score his goals in batches.
“Hopefully that might bode well for us heading into Sunday’s game.”
• Leicester take a 1-0 lead into the second leg of this play-off semi-final, courtesy of Dave Nugent’s first goal in 17 appearances in Thursday’s match at the King Power Stadium.
• Of 56 meetings in all competitions over 104 years, Leicester have won 23, Watford 17, with 16 drawn.
• Watford are unbeaten in five home Championship matches against the Foxes, and are chasing a fourth successive Vicarage Road victory over them.
• Leicester last avoided defeat at the Hertfordshire club in September 2009, when they shared six goals. Their most recent victory there was 2-1 in October 2005.
• The winners will face either Crystal Palace or Brighton at Wembley on Monday, 27 May for a place in the Premier League.
• If Watford are to reach the final, they will have to successfully overturn a first leg deficit in a play-off semi-final for the first time.
• On both occasions they qualified for the final and thereafter gained promotion to the Premier League, in 1999 and 2006, they had taken respective 1-0 and 3-0 leads into the second leg.
• The Hornets have lost only two of their last 10 matches at Vicarage Road, but have only won one of the most recent five; 4-0 against Blackburn on 20 April.
• Gianfranco Zola’s side, who have had to deal with the disappointment of missing out on automatic promotion on the last day, are hoping to qualify for their first visit to the new Wembley.
• The Championship’s top scorers, who netted 14 more goals than Leicester in the regular season (85 to 71), will need to become the seventh club to recoup a first leg deficit to make the final at this level. Only three clubs have lost the first leg of a second tier play-off semi-final and gone on to get promoted.
• The Hertfordshire club have spent six seasons at Championship level, since relegation from the Premier League in 2007.
• Leicester are taking a 1-0 lead into the second leg of a play-off semi-final for the second time. In the first in 1993, they beat Portsmouth to reach the second tier final, only to lose to Swindon by the odd goal in seven.
• This is Leicester’s sixth play-off campaign; all five previously have been at this level. They have played 15 play-off games (W8, D4, L3).
• They have never lost a play-off match on an opponents’ ground, and have won their last two.
• The Foxes have failed to reach the final once, and have been promoted to the Premier League twice through this route, in 1994 and 1996.
• The East Midlands club have spent the last four seasons in the Championship, and are hoping to return to the Premier League after an absence of nine years.
• Nigel Pearson’s side have won three of their last five games in all competitions and are vying for a third victory on the bounce.
• They too are targeting a first visit to the new Wembley. (BBC Sport)