Manchester United may have to reverse their Champions League quarter-final fixtures to accommodate neighbours Manchester City.
The pair join fellow Premier League sides Liverpool and Tottenham in Fridays draw in Nyon, Switzerland, where the route to the Madrid finale will be decided.
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There is no seeding or country protection at this stage, but UEFA has announced that United will have to reverse their fixture if drawn at home in the same week as rivals City.
England has four teams in the quarter-finals of the Champions League for the first time in a decade after Liverpool joined both Manchester clubs and Tottenham in the last eight of the competition with victory over Bayern Munich.
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Not since Liverpool, United, Arsenal and Chelsea reached the same stage in 2008-09 have Premier League teams been so dominant in Europe – although Barcelona ended up as champions that season.
The English clubs will have to wait until Friday to find out if they have avoided one another as they go into the draw with Barca, Juventus, FC Porto and Ajax. In the meantime, MailOnline takes a look at how well the four teams are equipped to go all the way in the Champions League this season.
English footballs most successful club in the European Cup progressed to the final under Jurgen Klopp a year ago and will be hoping to go one better this season.
For all Citys goals against Schalke in the last-16 and Uniteds guts in coming back to beat Paris-Saint Germain, Liverpools 3-1 away win against an established European heavyweight like Bayern was just as impressive.
Klopps side are significantly stronger to the one that brushed City aside in the semis last season before losing to Real Madrid in the final in Kiev with the summer acquisitions of defender Virgil van Dijk and goalkeeper Alisson Becker making Liverpool a different proposition at home and abroad.
It has given the five-time European champions the defensive stability to complement one of the most feared forward lines on the continent.
Allardyce is also worried about the form of Liverpool’s attacking trio ahead of their match against Bayern Munich, he said: Lets hope they can get that extra bit of quality from their front line tonight because that could be the key for them to beat Bayern.
Critics will point to Klopps record in losing his last six cup finals as manager of Liverpool and Borussia Dortmund – including Champions League final defeats with both clubs – but the German will fancy his chances if he gets there again.
Occasionally people can get under your skin but you cant show the slightest sign of weakness because people will say youre losing it or youre out of control, and that can pass over to your players, Allardyce told talkSPORT.
Key player: Virgil van Dijk. The Dutch colossus demonstrated his importance to Liverpool again in Munich, contributing to the first goal and scoring the crucial second while keeping Robert Lewandowski under wraps.