Palace team mates Christian Benteke and Andros Townsend were involved in a furious confrontation after the full-time whistle.
Despite securing a vital win in their quest to avoid relegation, the players stood toe-to-toe in an angry exchange.
Benteke was furious with Townsend for not passing him the ball in the closing stages of the game, the England international instead choosing to shoot.
Belgium striker Benteke let his colleague know his feelings after the full-time whistle.
Middlesbrough goalkeeper Victor Valdes eventually intervened to stop the argument escalating.