Olivier Giroud helped Chelsea to a 2-1 win over Malmo in the first leg of their round of 32 Europa League fixture while Celtic crashed to a 2-0 home defeat against Valencia.
Chelsea make hard work of Malmo
Chelsea responded from their embarrassing mauling at Manchester City with a jittery 2-1 win over Malmo in Thursday night's Europa League last-32 first leg in Sweden.
The Blues' 6-0 loss to City was their worst defeat in 28 years and heaped mounting scrutiny on head coach Maurizio Sarri, whose concerns were eased, at least temporarily, by Ross Barkley after 30 minutes.
Olivier Giroud netted his fifth goal in six Europa League appearances with a neat back-heel to make it 2-0, but at present nothing is straightforward at Chelsea.
What should have been a routine return in next week's second leg resulting in straightforward passage to the last 16 will now be a nervy affair after Anders Christiansen's strike 10 minutes from time.
Celtic brushed aside by Valencia
Celtic will need to produce some magic in the Mestalla Stadium next week following their 2-0 Europa League defeat by Valencia at Parkhead.
Russia international Denis Cheryshev scored for the well-drilled visitors three minutes before the interval in the first leg of the last-32 encounter.
It was the first goal the Scottish champions had conceded at home since the 2-1 win over Salzburg two months ago and the second came in the 49th minute when debutant striker Ruben Sobrino knocked in a cross from Cheryshev.
The Spanish side controlled most of the match after that to hand Brendan Rodgers' side their first defeat of 2019, ending a run of seven straight wins, and leave the Scottish champions all to do and more in Spain next Thursday.
Round of 32 results (late games), Thursday February 14
Napoli in control
Carlo Ancelotti saw his Napoli team take a similarly strong grip on their tie against FC Zurich in Switzerland as Lorenzo Insigne and Jose Callejon struck inside the opening 21 minutes.
Piotr Zielinski made it 3-0 with 13 minutes remaining, although Benjamin Kololli's late penalty provided some consolation for the Swiss.
Shakhtar Donetsk skipper Taison secured a 2-2 draw with Eintracht Frankfurt despite his side having to play for 79 minutes with 10 men.
Marlos had already cancelled out Martin Hinteregger's opener when Taras Stepanenko received his marching orders for a second bookable offence.
Filip Kostic then restored Eintracht's lead but Taison's 67th-minute equaliser denied the Germans victory.
Club Brugge came from behind to beat Red Bull Salzburg 2-1 as goals from Stefano Denswil and Wesley overhauled Zlatko Junuzovic's 17th-minute effort, while Ludek Pernica's double did the trick in a 2-1 win for Viktoria Plzen, who had trailed to Dani Olmo's goal for Dinamo Zagreb .
Alfonso Pedraza's third-minute strike was enough to hand Villarreal a 1-0 win at Sporting Lisbon, whose hopes of a fightback were dashed when defender Marcos Acuna was sent off for a second bookable offence with 14 minutes left.