The conflict in his home country has led to Oleksandr being handed the captain's armband for the FA Cup tie.
Fernandinho was initially named the captain.
The former Brazil player offered the armband to the young man in a show of support.
The City boss said that he was in the right frame of mind to play.
The captains of the teams held the Ukrainian flag on the pitch before the game started.
A message on the big screen read "We Stand With Ukraine" while fans held up a banner with the same message on it.
The game will be the first time that the 25-year-old has played since Russia invaded his homeland.
Last week, he joined an anti-war rally in Manchester and was emotional as he embraced Vitaliy Mykolenko before the game.
The governing bodies of Russia and its athletes should be banned from international competition.