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Former Manchester City striker Mario Balotelli converted an injury-time penalty to rescue a 1-1 draw for AC Milan at Ajax in the Champions League.

Milan had looked set for defeat when Stefano Denswil headed in unchallenged in the last minute of normal time.

But Balotelli slotted home after Mike van der Hoorn was controversially ruled to have pulled him down in the box.

Elsewhere, Borussia Dortmund brushed aside Marseille 3-0 as boss Jurgen Klopp served a touchline suspension.

Striker Robert Lewandowski, who denied last week that he has signed a pre-contract agreement with Bayern Munich, scored twice - with Marco Reus's free-kick deceiving Marseille goalkeeper Steve Mandanda in between the Pole's strikes.

Milan's draw means they lie second in Group H, two points behind Celtic's conquerors Barcelona ahead of back-to-back European games against the Catalans.

Dortmund lead those chasing Group F leaders Arsenal, who maintained their 100% record in the Champions League with a comfortable 2-0 home win over Napoli.

Chelsea, the other Premier League team in action on Tuesday evening, recovered from a home defeat to Basel in the group opener with an emphatic 4-0 win away to Steaua Bucharest in Group E.

Basel's home match against Schalke was temporarily halted in the first half when environmental protestors abseiled from the roof of St Jakob Park.

The visitors took all three points with 20-year-old Germany international Julian Draxler's superb half-volley from the edge of the area proving decisive.

Atletico Madrid emerged victorious from the meeting of two of Europe's form sides as Turkey international Arda Turan scored an 86th-minute winner against Porto.

The Spaniards have won all seven of their league games this season, including a 1-0 win over city rivals Real Madrid last time out, but fell behind to Jackson Martinez's header before Diego Godin and Turan struck to turn the tie around.

In Group G's other game, Austria Vienna and Zenit St Petersburg played out a drab goalless draw, which will suit neither side after defeats in their opening games.