NYON, Switzerland (AP):Real Madrid will face Manchester United in a mouth-watering Champions League last-16 clash that sends Cristiano Ronaldo back to where he made his reputation, and Jose Mourinho to the club many believe he wants to coach one day.

United manager Alex Ferguson called it "the tie of the round," and Real Madrid director Emilio Butragueno said it would be "thrilling for everybody."

In another blockbuster pairing in yesterday's draw, Champions League favourites Barcelona and Lionel Messi will play seven-time winners AC Milan.

Arsenal will face Bayern Munich, last season's beaten finalist, and big-spending Paris Saint-Germain was paired with Valencia.

Also, it was: Celtic vs Juventus, Shakhtar Donetsk vs Borussia Dortmund, FC Porto vs Malaga, and Galatasaray vs Schalke.

First-leg matches are to be played from February 12-20. Return matches are from March 5-13.

top billing

The storied history of nine-time European champions Madrid and three-time winners United would be enough to ensure their matchup top billing, with the first leg in Spain on February 13.

The friendly rivalries of Mourinho and Alex Ferguson in the dugout, and star forwards Ronaldo and Wayne Rooney on the pitch add an extra dimension.

"It's a great opportunity for our fans to see Cristiano again and also for me to meet up with Jose again," Ferguson said in comments posted on the club's official website.

The coaches met in Manchester this month, ahead of Madrid's group match against English champion City, adding to speculation that Mourinho covets the United job.

"(Mourinho) is a fantastic manager, a fantastic coach, and of course, this tie is going to be a challenge for all of us," Butragueno said, declining to discuss whether the reportedly unhappy Portuguese will leave Madrid after the season.

It was at Old Trafford where Mourinho truly arrived on the international scene with a flamboyant victory sprint down the touchline as his Porto team eliminated United in the last 16 in 2004, the first of Ronaldo's six seasons in England before joining Madrid.

"It is going to be very special for Cristiano," said Butragueno of the Portugal forward, who is the competition's top scorer with six goals. "He is an extraordinary professional. I am sure he is going to do his best to help us qualify."

United defender Rio Ferdinand wrote on Twitter: "Oh yes, Madrid!! What a great couple a games that'll be!! @Cristiano see u soon bro!!"

Milan had the misfortune to draw Barcelona again after being unable to beat the Catalan side in four matches in last season's group stage and quarter-finals.

"They're not pleased, we're not pleased, but this is what the destiny is," Milan director Umberto Gandini told The Associated Press with a smile. "We have to go over the most difficult team on the planet."

Barcelona director Amador Bernabeu said the matchup, which opens in Milan, would be a meeting of two "important, classic teams."

The storied history of nine-time European champions Madrid and three-time winners United would be enough to ensure their matchup top billing