The Spanish giants sealed top spot in Group B with a heavy victory over the Turkish champions, despite playing for much of the match with 10 menReal Madrid survived Sergio Ramos' first-half red card to secure a thumping 4-1 win over Galatasaray at the Santiago Bernabeu.
The Spain defender received his marching orders with the score locked at 0-0 for tugging back Umut Bulut, but Carlo Ancelotti's side soon raced into the lead thanks to a Gareth Bale free kick.
Bulut soon leveled the scores, but Alvaro Arbeloa put the hosts back ahead just after the break, before goals from Angel Di Maria and Isco left Madrid with a 4-1 win which secures top spot in Group B.
Real was without Cristiano Ronaldo (thigh), who was nonetheless the center of attention as fans showed their support for the forward's bid to be crowned Ballon d'Or winner by displaying banners and wearing masks of the Portuguese's face.
Coach Carlo Ancelotti also rested Xabi Alonso, Karim Benzema and Alvaro Morata, with Jese Rodriguez selected up front and Casemiro handed his debut in the competition.
Opposite number Roberto Mancini, who was not in charge when the Turkish side was humbled 6-1 in the reverse fixture, left Burak Yilmaz and Wesley Sneijder on the bench.
Madrid should have taken the lead inside the opening four minutes when Bale was sent racing clear by Isco, but the Welshman side-footed wide with only the goalkeeper to beat.
But the momentum threatened to shift when Ramos, who was the last man, was given his marching orders after making the slightest of contact with a goal-bound Bulut.
Jese had to make way in the tactical reshuffle as Nacho was introduced, but Bale put the 10 men ahead eight minutes before halftime with a dipping 25-yard free-kick that looked to have deceived Eray Iscan in goal.
The lead was short-lived, however, as Umut collected Didier Drogba's pass before coolly slotting past Iker Casillas two minutes later.
Real went back ahead six minutes after the restart, Di Maria swinging in a low cross from the left to find the most unlikely of scorers in Arbeloa, who tucked home with surprising confidence amid suspicions of offside.
Arbeloa's spell in the spotlight did not end there and he was booked for diving in the 55th minute, before turning provider for Di Maria with 63 minutes gone.
Casillas produced a stunning save from Drogba's header before Isco added the fourth with a clever turn and finish in the box, and there there was no way back for Mancini's men, who must now beat Juventus in the final group game to qualify.
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