The Cameroon striker, whose Barca days looked to be numbered after he was told he could leave the club earlier this summer, bagged a brace in his side's 4-0 win at the Nou Camp.

Eto'o opened the scoring after 17 minutes and rounded off the rout seven minutes from time as the Catalans took a step towards a place in the group stages.

Xavi and Thierry Henry were also on target either side of half-time for the Primera Liga side, who are looking to end a two-year silverware drought.

After appearing against the Polish outfit, Eto'o is now ineligible to represent another side in this season's competition.

Juventus had little trouble establishing a commanding first-leg lead over Slovakian side Artmedia Petrzalka as they strolled to a 4-0 win at the Stadio Olimpico.

Mauro Camoranesi opened the scoring after just seven minutes and Alessandro Del Piero made it two shortly before the half-hour mark.

Giorgio Chiellini added a third to all but settle the tie before half-time and Nicola Legrottaglie completed the rout in stoppage time.

Last season's quarter-finalists Schalke hold the upper hand against Atletico Madrid after a 1-0 first-leg win in Gelsenkirchen.

Left-back Christian Pander scored for the Bundesliga side as new coach Fred Rutten celebrated victory in his first game in charge.

Atletico's cause was not helped by the sending off of Antonio Lopez with 14 minutes remaining.

Dynamo Kiev all but booked their place in the group stages with a thumping 4-1 win away to Spartak Moscow

Ismael Bangoura and Artem Milevskiy bagged a brace apiece to turn the game at the Luzhniki Stadium on its head after Nikita Bazhenov had given the Russians an early lead.

And there could be two Ukrainian sides in the competition proper after Shakhtar Donetsk claimed a 2-0 first-leg win over Dinamo Zagreb.

Croatian Darijo Srna put the hosts ahead after just three minutes and Evaeyerson Brandau doubled their advantage.

Shabani Nonda scored twice as Galatasaray came from two goals down to draw 2-2 at home to Romanian outfit Steaua Bucharest.

The visitors raced into a 2-0 lead through Dayro Moreno and Banel Nicolita inside 12 minutes, but Nonda's double either side of half-time brought the Turks level.

Fenerbahce, surprise quarter-finalists last season, survived a scare at Partizan Belgrade as they came from 2-0 down to rescue a 2-2 draw.

Goals from Veljko Paunovic and Milos Bogunovic put the Serbians in the box seat early on, but Alex converted a penalty on the stroke of half-time to halve the deficit.

And summer signing Daniel Guiza grabbed an equaliser for Luis Aragones' side five minutes after the restart.

Elsewhere, Marseille saw off SK Brann in Norway, Benoit Cheyrou with the only goal of the game five minutes before the break.

Greek giants Olympiacos came unstuck against Anorthosis Famagusta, going down to a surprise 3-0 in Cyprus.

But another Greek side, Panathinaikos, fared better as they won 2-1 away at Sparta Prague.

Belorussian champions BATE claimed a 1-0 win at Bulgarian side Levski Sofia, while AaB were 2-0 winners over Kaunas of Lithuania, who knocked out last season's UEFA Cup finalists Rangers in the last round.