Mata declared there was no point Chelsea's players bemoaning owner Roman Abramovich's hiring-and-firing policy, which sees the Spain midfielder serving under his third manager in nine months.
"The players have to be professional and work no matter who the manager is of the team," he said.
"We have an owner. We have people who are working, trying to do their best for this club and, as a player, I just have to work with the manager we have now.
"Now it's Rafa."