Holders Real Madrid will face city rivals Atletico Madrid in the last four of the Champions League, in a repeat of last season's final, with Juventus paired against Monaco in the other semi.
They recorded an 11-2 aggregate win over AZ Alkmaar in the round of 32, a 5-4 aggregate win over Roma in the last 16 and a 3-3 draw with Besiktas over two legs in the quarter-finals, with the French side advancing on penalties.
The semi-final first legs will be played on Tuesday 2 May and Wednesday 3 May, with the returns the following week.
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United have never faced Celta in UEFA competition and the Spanish side are through to a major European semi-final for the first time in their history.
According to the Soccer Power Index (SPI), Real are 67 percent likely to beat Atletico, with Juve rated 70 percent likely to defeat Monaco.
The return fixtures will be played the following week, when Atletico will be hoping to end their Champions League heartache by finally overcoming their rivals.
Real Madrid have been Atletico Madrid's kryptonite in the UCL, as another Madrid derby is set for the semifinals.
Massimiliano Allegri's men impressively defeated LaLiga's champions 3-0 on aggregate in the quarter-finals this time, though, and remain on track for a Serie A, Coppa Italia and Champions League treble.
On paper, they're undoubtedly the strongest side remaining in the competition, but as demonstrated against Anderlecht and on numerous occasions in the Premier League, wasteful finishing has been a hallmark of their season and can make life hard against teams they should be beating. Atletico have a chance against the champions and 11-time winners: clean sheets are now rare commodities at the Bernabeu and Real have not kept a single one in the Champions League all season.
Beaten Barcelona defender Gerard Pique has tipped Italian champions Juventus to lift the trophy they last won in 1996 and they will be favourites against Monaco, especially because the second leg will be in Turin.
"Monaco! Strong team with many talented players and an impressive run this season".
Which teams do you think will reach the Champions League final, and who do you think will win the competition? "We're better than two years ago, no doubt about it".