The Blues suffered a defeat on penalties at Wembley against Liverpool, with the game ending 0-0 after 120 minutes.
However, Chalobah felt that a second half challenge from Keita deserved a red card, especially after VAR reviewed the incident.
"Had to get stitches because of this," he wrote on social media post-game.
"Referee is right there I don't get it??"
Had to get stitches because of this. Referee is right there I don't get it?? https://t.co/8kXIgpS4wO
— Trevoh Chalobah (@TrevohChalobah) February 27, 2022