Just when relations between the two clubs appeared to be as fractious as imaginable, a pre-match diplomatic incident involving a former Manchester United winger tipped this bitter rivalry into Cold War territory.
Zoran Tosic, once (wrongly) tipped for great things at Old Trafford by Sir Alex Ferguson, had been set to face City in this Group E fixture until his visa was deemed invalid at Border Control when CSKA landed in Manchester on Tuesday afternoon.
With the two clubs already at odds, Tosic’s treatment at Manchester Airport sent the Russians into a rage.
The player was told he was not only unable to play against City, but also that he would not be allowed to attend the game.
“Initially there was a discrepancy and he was issued not a tourist visa, but a transit visa,” said CSKA general manager Roman Babaev.
“The English consulate advised that Serbs do not really need a tourist visa, but the English border guards showed some over-adherence to the rules and found on the internet that he is a CSKA player, and felt that he had come to England to work.
“They demanded a work visa, which is impossible and unacceptable. They seized his passport, which is also the first time in our experience that a passport of a citizen of another country has been confiscated.
“The English migration service has received several requests from the Serbian consulate in England and the Russian embassy in England.
“They considered the matter at length and in the end, not only did he not go to the match, he was even forbidden to be a spectator and they demanded that he leave the territory of Manchester before the match.
“Will we submit a protest? English people still can’t calm down, but I think there is already no sense in it, because it already won’t affect the result, but it’s not very pleasant. I am sure that this would not happen in any other European country.”
Up in the boardroom, the stunt pulled by the CSKA officials last season, when they attended a pre-match banquet in jeans, trainers and tracksuit tops in protest at City’s reaction to the racist abuse directed at Yaya Toure in Moscow last year, would have ensured a thickening of the permafrost between the clubs. At least they could talk about the price of oil.
Finding common ground in the Champions League is proving difficult for everybody connected to City, but they still live in hope of qualification and, if they can pull it off, that might be the moment when they finally get it.