Cristiano Ronaldo headed the winner nine minutes from time as Manchester United came back from two goals down to record a memorable Champions League triumph against Atalanta at Old Trafford.

Ole Gunnar Solskjaer's side had been booed off at the break, such was the lack of invention they showed in falling behind to goals from Mario Pasalic and Merih Demiral.

But the jeers turned to cheers as United, roared on by an increasingly frenzied crowd, rallied to complete one of their great European victories.

Marcus Rashford reduced the deficit with an excellent finish eight minutes after the restart before skipper Harry Maguire drove home after being left free at the far post to get on the end of Edinson Cavani's flick.

But, inevitably, it was Ronaldo who won the game, just as he did three weeks previously against Villarreal.

This time it was with one of his trademark headers as he rose to meet Luke Shaw's cross and find the bottom corner to send United to the top of Group F.

Chelsea put their Champions League campaign back on course by thrashing Malmo at Stamford Bridge - but it was victory at a price as strike duo Romelu Lukaku and Timo Werner suffered injuries.

The holders lost their last game against Juventus in Turin but there was no mistake here as the Swedes were completely outclassed.

Andreas Christensen put Chelsea ahead early on with his first goal in 137 appearances for the club from Thiago Silva's pass and Jorginho doubled the lead from the spot after Lukaku was fouled by Lasse Nielsen, the forward limping off with what looked like an ankle injury.

Werner pulled up with hamstring trouble before half-time, but Chelsea's progress continued smoothly as his replacement Callum Hudson-Odoi set up another substitute Kai Havertz for a neat finish for their third just after the break.

Malmo were over-powered and Jorginho scored from the spot again after 57 minutes following Eric Larsson's foul on Antonio Rudiger, with replacement keeper Ismael Diawara having no more success than Johan Dahlin did in the opening half.

Gerard Pique scored Barcelona's first Champions League goal this season as Ronald Koeman's side beat Dynamo Kyiv to end their losing start to Group E.

Pique volleyed in a superb opener from Jordi Alba's cross as the hosts found the net in Europe for the first time in more than four and a half hours.

Barcelona were comfortable, if not clinical, and success keeps their hopes of reaching the knockout stage alive.

They sit third, one point behind Benfica, who play Bayern Munich later.

Other Results.

Benfica 0-4 Bayern Munich

Young Boys 1-4 Villarreal

FC Red Bull Salzburg 3-1 VfL Wolfsburg

Lille 0-0 Sevilla

Zenit St Petersburg 0-1 Juventus