David Beckham was sent off as Real Madrid were held to a goalless draw at home by Real Betis on Saturday.
Beckham was incensed at being denied a foul seconds before
Beckham was shown a straight red card in injury-time at the Bernabeu after scything down Isidoro from behind on the edge of the Betis penalty area.
The former England captain was only recalled to the Real Madrid side last week following a six-match exile.
His decision to join American side LA Galaxy at the end of the season had angered coach Fabio Capello.
Beckham scored on his return to the team last week after Capello had gone back on his threat never to select the midfielder again.
"We have had little help from referees this year," said Capello.
"It was a foul in favour of Beckham (moments before) and I think the referee was a little quick to flash a red card.
"I've seen it on television and I don't think it merited a red card."
Real's sporting director Predrag Mijatovic was also unhappy with Beckham's dismissal.
"I don't know what has happened but I have the feeling the referees are
against us," said Mijatovic, a former Real player.
"There were plays and cards that I did not understand, nor does anybody.
"We are not going to complain but it is necessary to highlight it.
"We have always remained quiet but the time has come to say something."