Uruguay international Suarez was punished on Wednesday by the English Football Association (FA) after he bit the arm of Chelsea defender Branislav Ivanovic at the weekend.
"He knows he is in the wrong, and that it was a mistake, but the 10-game punishment seems absurd to me, excessive and unfair," Spanish international Reina was quoted as telling radio station Cadena Cope by sports daily AS on Thursday.
"I consider myself a friend of Luis. He is being treated differently, I don't know if it is because he is Uruguayan or because he has been involved in similar episodes.
"It seems the people who make the decisions have it in for him.
"There is a lot of hypocrisy. There have been cases of racism where they have handed out a four-game ban, and he got eight."
Suarez served an eight-match ban for racially abusing Manchester United's Patrice Evra last season.
Liverpool have expressed their shock at the FA's decision and have until Friday to appeal against the ban on their leading scorer.
Get the best features, fun and footballing frolics straight to your inbox every week.
Thank you for signing up to Four Four Two. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.