Jorge Sampaoli fears resurgent Leicester could wreck his birthday and Sevilla’s bid to make history.
Sevilla , who are are third in La Liga, are chasing a maiden Champions League triumph after winning the Europa League the last three years.
Sampaoli’s side have a 2-1 lead from the last 16 first leg in Andalusia last month ahead of the return at the Premier League champions.
Argentine coach Sampaoli turned 57 on Monday as his side flew into Leicester for Tuesday’s match.
He is on his guard after Leicester won both their Premier League games 3-1 against Liverpool and Hull after replacing Claudio Ranieri with Craig Shakespeare.
Sampaoli said: “Putting my birthday to one side it is important to make the quarter-finals.
“That would be an ideal way of celebrating.
“But certainly I think the Leicester you see playing currently , with the fantastic performance when they dominated against Liverpool and Hull, you are seeing the Leicester who won the league.
“They are hugely motivated and it will be a difficult match.”
Sevilla could have been out of sight after dominating the Foxes at home last month, including missing a penalty, before Jamie Vardy scored a crucial late away goal.
Defender Adil Rami admitted: “It was a very important goal by Vardy.
“It has made it a little bit more tricky for us.
“But we are an offensive side and we always go out to score and it will be our intention to go out to try and score our away goal.”