Cristiano Ronaldo believes Bayern Munich could be the team to derail Manchester United's bid for a second successive Champions League crown.
The two sides met famously in the 1999 final when two goals in the dying moments from substitutes Teddy Sheringham and Ole Gunnar Solskjaer earned United a 2-1 win.
The draw for the quarter-finals and semi-finals of this year's competition takes place in Nyon, Switzerland on Friday. And Ronaldo is hoping United can avoid the Bundesliga champions, telling United's official website, www.manutd.com: "Bayern Munich are very strong. I watched them play against my old team, Sporting Lisbon, and I was very sad because I didn't expect Sporting to lose so heavily."
He added: "But this can happen in football. Bayern are very good - they have mature players, strong players, quick players... Franck Ribery and Miroslav Klose are very impressive.
"Bayern play like a team and they look very difficult to beat."
Germany striker Klose will not feature in the last eight as he has been ruled out for six weeks with an ankle injury, but compatriot Lukas Podolski, who will rejoin Cologne in the summer, appears to have finally found some form at the Allianz Arena.
Podolski is not concerned who Bayern, whose fine European form is in contrast to their mediocre results in the league, are paired with in the quarter-finals.
"It doesn't bother me at all. We are unbeaten in the Champions League and want it to stay that way - whether we now face Barcelona, Porto or someone else," he said on Bayern's website, www.fcbayern.de.
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