REAL Madrid assistant manager Aitor Karanka was unhappy at the treatment meted out to Cristiano Ronaldo in last night's 1-0 Champions League win at Dinamo Zagreb.
Ronaldo was on the end of several heavy challenges as Madrid earned the three points courtesy of Angel Di Maria's 53rd-minute strike.
The visitors were also aggrieved to have full-back Marcelo sent off after receiving a second yellow card for diving with 17 minutes to go.
Karanka, standing in for the suspended Jose Mourinho, said: "It's worrying to see Marcelo was sent-off when Cristiano Ronaldo is receiving stitches in the dressing room.
"All players should be equally protected."
Despite the complaints with the match officials, Karanka was otherwise satisfied with a winning start to their Group D campaign.
He added: "Those who thought it would be an easy game were wrong. Dinamo were very motivated tonight.
"There are surprises at every venue and it's never easy to win. We took three points from a complicated venue. They have a great crowd that boosted their confidence.
"We must keep this up, growing and working hard to do a good job. It's easier to work when you earn positive results. If we keep this up we'll reap rewards.
"We've been thinking solely on ourselves since the pre-season. Things are better each day and we should reap rewards if we carry on this way."