The speedy attacking midfielder was born in Yerevan in January 1989 and speaks fluent, accent-free Russian.
Fans of Russia's Spartak and CSKA football clubs will conduct a Gentlefan welcoming event for their United Kingdom counterparts who come to Moscow to watch UEFA Champions league group stage matches, according to the Russian Football Union website. United head into the game unbeaten in their last eight games with the latter being a 1-0-win over Southampton at the St Mary's.
However, they did win both the Europa League and League Cup in Mourinho's first campaign in charge last season.
Phil Jones won't feature so Chris Smalling could come in to join Eric Bailly at the back while Anthony Martial and Jesse Lingard are also pushing for recalls.
Mourinho refused to criticise referee Craig Pawson for not sending off Long, as he suggested the official would have made a different decision if he could have looked at the incident on a video replay.
The player will not take part in tomorrow's game, having picked up an injury, but said the trip to Moscow did throw up the opportunity to reconnect with his Russian following from the Armenian diaspora.
"I won't have Fellaini, I won't have Pogba, we won't have Carrick, so all three midfield players that we lose for this match", he said. But we try not to focus on individual battles or specific areas on the pitch.
Manchester United are 4/6 to come away with a win. He was so calm and in control and I think he had a great performance.
In the meantime, Mario Fernandes (concussion) remains doubtful for CSKA Moscow.
"This year we have the Champions League and we are all concentrating on winning it", he told a news conference in Moscow on Tuesday. CSKA won its first #Champions League Game against Benfica, but this time, a team from the toughest league is coming to face them.
In a statement on the club's website on Monday, United said: "All supporters must use the official bus service provided, and we ask that you ensure your behaviour is impeccable at all times. I have started very well and will do my best to carry on".