(Bloomberg) -- Sports broadcasters have voiced their concern to UEFA over whether to screen advertising from Gazprom PJSC, the Russia-backed energy producer, throughout Wednesday’s coverage of the European Champions League football matches.

Gazprom is a major UEFA sponsor and has a contract worth a reported 40 million euros ($45.4 million) per season. Following Moscow’s recognition of two breakaway regions within Ukraine, broadcasters are seeking guidance on whether to show Gazprom advertising in the face of growing customer concerns, according to people familiar with the situation. 

UEFA could inform broadcasters of its decision on Wednesday afternoon ahead of tonight’s matches, which include Atletico Madrid versus Manchester United, the people said, who asked not to be named discussing private information.

A spokesperson for Gazprom was not immediately available for comment. A spokesperson from BT Sport said it was “concerned” by customer reactions and was reviewing the situation.

“Regarding Gazprom, UEFA will continue to closely monitor the situation. We have no further comments to make on the topic at this stage,” a UEFA spokesperson said.

BT Sport shows the Champions League competition exclusively in the U.K., DAZN broadcasts in Germany and Canada, while various other broadcasters show the prestigious competition across the world. 

Two games shown Tuesday in the U.K. were accompanied by prominent ads on BT Sport for Gazprom, while inside Chelsea F.C.’s Stamford Bridge, which is owned by the Russian billionaire Roman Abramovich, there were prominent LED displays managed by UEFA advertising Gazprom. 

Abramovich may be at risk of U.K. sanctions if tensions with Moscow over Ukraine continue to escalate, with the British foreign secretary refusing to rule out such a move.

A spokesperson for Chelsea F.C. declined to comment.

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