The Uruguay international was handed the punishment on Wednesday after an independent panel decided the incident involving Chelsea's Branislav Ivanovic warranted additional punishment above the statutory three-game suspension for violent conduct.
Fears have already been raised that Suarez, who served a seven-match ban for biting PSV Eindhoven midfielder Otman Bakkal in November 2010 immediately before his move from Ajax to Anfield, could quit England in the summer as a result of the ban.
"I consider myself a friend of Luis. He is being treated differently, I don't know if it's because he's Uruguayan or because he's had a previous episode like this," Reina told Spanish radio station Cadena Cope.
"He knows full well that what he did was wrong but a 10-game ban seems to me absurd, out of proportion and unfair.
"It seems that the people making the decisions have got it in for Luis a little bit. That's the way I see it. I am not justifying what he did but the punishment is very disproportionate.
"He knows he was in the wrong, he knows he has made a mistake but the treatment is completely out of place.
"Those who know Luis know that he is the complete opposite (off the pitch), he is a magnificent person and great team-mate. But because of the way he plays, he is aggressive and very competitive, he plays like a street player and sometimes the way he is gets him into trouble."
Liverpool managing director Ian Ayre has stressed they have no intention of selling Suarez, who signed a new four-year contract last summer, but that may not be enough to persuade the striker to remain in England - especially with clubs like Bayern Munich and Juventus interested in him.
"Right now he is a Liverpool player," said Reina. "He is having a bad time of it and so is his family. He is certainly good enough to fit into any team in the world."
- Sports & Recreation