Khabib is a big Real Madrid fan and close to club legend Cristiano Ronaldo.
He posted to social media: "I think Xabi Alonso is one of the three best coaches in the world today. If this team didn't work well with him, we need to change the players, not the coach.
"I'm sure no coach can manage this lineup at Real Madrid. We need to get rid of the temperamental players."
One of the triggers for Xabi's departure was the discontent of certain players with his methods and training style, something that 'The Eagle' finds intolerable.
"If you come to the gym or the pitch, it doesn't matter if they're wrestlers or football players, the head coach is in charge. But if you have such an aura around your team that not everyone meets your requirements, then you're definitely not on the right track," he continued.
Khabib also stated: "There's nothing like loyalty. A year ago they were begging him, and now they're firing him because of spoiled brats. Xabi, you're the best."