Real boss Carlo Ancelotti backed Bellingham at his post-match press conference on Saturday, saying: "I think the referee did not understand Jude Bellingham's English.
Speaking about the sending off, Bellingham was quoted in the Spanish media as saying: “I do not want to go into the details of what was said, but I didn't insult the referee.
Jude Bellingham has been handed a two-match ban in La Liga following his red card at Osasuna on Saturday.
The Real Madrid midfielder was sent off for foul and abusive language by referee Jose Luis Munuera Montero during a 1-1 draw in LaLiga.
The governing body announced on Wednesday that it had dished out the ban for what it called "disrespectful or inconsiderate attitudes towards referees, managers or sports authorities".