(CNN) Jockey Luis Saez was disqualified for a rules infraction while riding Maximum Security in the Kentucky Derby.

Now he has been suspended by racing stewards for 15 racing days, according to a document on the Kentucky Horse Racing Commission website

Saez was suspended "for failure to control his mount and make the proper effort to maintain a straight course thereby causing interference with several rivals that resulted in the disqualification of his mount," says the letter dated Sunday.

The dates of his suspension are May 23-27, May 30-June 2, June 6-9 and June 13-14.

Sean Deskins, an attorney for the jockey, told CNN that Saez plans to file an appeal, which must be done within 10 days.

Read More