Galatasaray manager Roberto Mancini believes the current Real Madrid side are arguably even stronger than the one he faced as Manchester City boss last season.
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The Spanish giants helped eliminate City at the group stages in last year's competition, but after exiting at the semifinal stage for the third consecutive season coach Jose Mourinho left the club to be replaced by Carlo Ancelotti.
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Real also overhauled their squad by spending over €150 million on a number of new recruits, most notably on Gareth Bale.
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And Mancini believes those changes make the Real side the Turkish champions will face on Wednesday at the Santiago Bernabeu even more dangerous.
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"I think that Madrid were strong last season and they are strong this year. You could even say they have improved because Bale has arrived and they have changed coach," he said.
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"We are talking about the best of the best so to play here is always difficult.
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"I think that Carlo is one of the best coaches in Europe. He has managed the best teams. He is a composed person, a good person, things that are very good in a coach."
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Madrid are almost certain to go through to the knockout phase as they have a six-point lead in the group with just two games remaining.