The pair of Costa and Willian, both Brazilians paid tribute to Chapecoense players and staff who died in a plane crash earlier this week during their celebrations against Manchester City.
A plane carrying the Brazilian football club crashed Monday night, killing 71 persons, including the coach and majority of the squad.
A minute’s silence was observed at the Etihad stadium before kickoff, but that wasn’t the only time respect was paid to Chapecoense.
After Gary Cahill’s own goal gave City the lead, Costa restored parity in the second half after a sublime pass from Fabregas.
The Brazilian born striker pointed to the black armband all players wore in the game, which had a message of support for the club written on it.
Later in the game, fellow Brazilian Willian put the Blues ahead and followed it up by taking the armband off and holding it up to the crowd.