London's Wembley Stadium could be left as the only candidate to stage the semi-finals and final of Euro 2020, with German football chiefs considering pulling their bid to focus on a tilt at hosting the 2024 edition.
The Allianz Arena in Munich is the only other bid submitted to UEFA for the showpiece matches in a tournament which will be staged across Europe.
"Our decision is open," said German Football Association (DFB) President Wolfgang Niersbach.
The DFB is talking to the English Football Association, he said, adding: "We have an excellent and wonderful relationship with the England FA.
"We are sitting together very often and thinking about the possibilities of how we can support the other association."
But with Niersbach confirming Germany will bid to stage the 2024 European Championship, it could choose to give up on staging the key matches of the 2020 tournament to avoid hurting its future bid.
Turkey also pulled out of bidding for any 2020 matches in April, with its eyes firmly fixed on hosting the following competition.
The country had been the favourite to stage the 2020 edition before complications, namely its ultimately unsuccessful bid to stage the Summer Olympic and Paralympic Games in the same year.
Wembley staged the Euro 1996 final, but the stadium has since been rebuilt and now seats 90,000 people, having reopened in 2007.
Germany last staged the tournament in 1988, as West Germany, and was the setting for the 2006 FIFA World Cup.
Both London and Munich are among 19 cities that could also be picked to host a "standard package" of matches - which will be made up of three group games and one knockout round match in either the last 16 or the quarter-finals.
Baku, Copenhagen, Rome, Jerusalem, Glasgow and Stockholm are among the other bids.
The competition is being held across the continent to celebrate the 60th anniversary of the first European Championship.
Twenty-four teams will play 51 games across a month of competition in 2020, with the dates for the tournament yet to be announced.
A decision on the 13 host cities will be made on September 19 in Geneva, Switzerland.
Euro 2016, the first to be held under the expanded format, will be played in France from June 10 to July 10.
April 2014: London and Munich go head-to-head to host Euro 2020 final, as 19 bids submitted
April 2014: Turkey withdraws Euro 2020 bid and eyes 2024, as Olympic bid conflict looms
September 2013: Russian Football Union proposes St Petersburg as Euro 2020 venue
March 2013: Platini Euro 2020 plan "lacks heart and soul" claims Blatter
February 2013: Amsterdam Arena confirms intention to host Euro 2020 matches