Real Madrid boss Zinedine Zidane was left frustrated despite his side's crucial 2-1 win over Bayern Munich at the Allianz Arena on Wednesday evening during the sides' Champions League quarter final first leg tie.

Madrid extended their lead over Barcelona at the top of La Liga to three points last weekend, with a game in hand still left to play. Two goals in the first half by the Argentine gave the Italians a commanding lead before Chiellini's first Champions League goal since 2009 made it 3-0.

Real Madrid punished Bayern's wastefulness after the restart as Christian Ronaldo restored parity after volleying home a cross from Daniel Carvajal with two minutes into the second half.

"We suffered here but all-in-all it's not easy to play here".

Ronaldo, the four-time world player of the year, volleyed Real level at the Allianz Arena early in the second half, then reached his milestone by slotting home the victor 13 minutes from time in the first leg.

Zidane had evidently made good use of the interval as Madrid appeared a different side in the second half.

"We have a small advantage but we have to be calm for the second leg".

More news: Raptors don't know why, but traditionally play better when backs against wall

"Maybe Real Madrid could have killed the qualification if they scored another goal but they didn't score and we try our best on Tuesday".

Zidane opted to take Gareth Bale off just before the hour, and revealed it was a precautionary measure aimed at keeping the Wales forward fully fit after his recent injury worries.

Real have scored at least once in each of their last 53 games and they are closing in on Bayern's European record of 61 consecutive games with at least a goal, from March 2013 to April 2014.

Ancelotti concedes that his old club have the edge but is refusing to accept defeat in Bayern's quest to reach the semi-finals.

Speaking of his brace, Ronnie continued: "Yesterday's [Wednesday's] goals would describe them very simply: impressive".

"At the end we are happy that it remained 2-1", he told Bayern's official website.

Ancelotti hopes to have striker Robert Lewandowski, who missed the first leg with a bruised shoulder, and defender Mats Hummels, ankle, back for the return. "The coach [Zinedine Zidane] has managed things well, with good squad rotation, and we're ready for the final stage of the season".