Christos Tzolis' 89th-minute goal snatched a 3-3 draw for Club Brugge as Atlético Madrid's defensive problems in the Champions League continued.

Having squandered a two-goal lead in nine second-half minutes, Joel Ordonez's own goal looked to have handed Diego Simeone's side an important advantage ahead of the second leg at home.

However, Raphael Onyedika, who had sparked the hosts' comeback, slid through a pass for Tzolis to shoot across goalkeeper Jan Oblak and a VAR check confirmed he had just stayed onside.

"The match was exactly what we expected. They're possibly the most intense opponent we've faced in the Champions League, they're very young," said Atleti coach Diego Simeone. "We knew it wouldn't be an easy game. We controlled the first half.

"With the score at 2-1, they got back into the game. We weren't attacking like we did in the first half. They made it 2-2, and we regained the lead, and then came that last goal, which was a misinterpretation of how we should defend."

Atlético have yet to keep a clean sheet in the competition this season and this was the third time they had conceded three or more goals, having shipped 15 goals in seven matches so far.

The visitors appeared to be cruising after goals from Julián Álvarez, his 12th in 18 Champions League matches, and Ademola Lookman, in first-half added time, gave them a comfortable lead.

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Álvarez fired home from the penalty spot in only the eighth minute after Joaquin Seys was contentiously judged to have handed the ball as it dropped from height.

Seconds before half-time Antoine Griezmann flicked on an inswinging corner and Lookman applied the final touch inside the far post.

Six minutes into the second half Oblak could only half-stop Nicolo Tresoldi's header from a corner and Onyedika scored from close range.

Brugge equalised on the hour when Mamadou Diakhon's left-wing cross was converted at the near post by Tresoldi.

Alexander Sorloth hit the crossbar with a header before Ordonez, under pressure from Sorloth, turned Marcos Llorente's cross into his own net with just 11 minutes remaining but Tzolis punished the visitors again late on.

"A match is 90 minutes, not 45," Simeone added. "We reacted well to their two goals.

"I leave with the feeling that the team competed very well against an opponent that isn't easy to beat here."

Simeone and Atlético host Brugge in the return leg at the Riyadh Air Metropolitano on Tuesday.

"In the first half, we felt we were playing well, but the context of the match suggests it was a fair draw. Both teams had scoring opportunities. The second leg is at home."