The Ukrainian outfit were twice forced to come from behind to ensure they were even on level terms for next week's second leg.

Gheorghe Bucur edged the Romanian visitors ahead after 20 and 80 minutes but on both occasions saw the lead wiped out, first through Olexandr Gladkiy on the hour and then thanks to Fernandinho with four minutes remaining.

The first leg between Sporting Lisbon and FC Twente finished goalless in the Portuguese capital, Joao Moutinho missing a 27th-minute penalty which could prove costly come the final reckoning in Enschede next week.

The goals flowed much more freely in Switzerland, where Maribor came from a goal down to take the upper hand with a 3-2 victory against Zurich.

Eric Hassli got the Swiss hosts back on level terms after a Marcos brace had overturned Johan Vonlanthen's early opener, but Zoran Pavlovic struck the game's fifth and final goal five minutes after the break to give the Slovenian outfit the advantage.

Olympiacos moved a step closer to clinching a play-off place with a 2-0 win in the away leg of their clash with Slovan Bratislava, Ioannis Papadopoulos and Leonardo netting the first-half goals for the Greek visitors.

FC Copenhagen also look favourites to progress following a 3-1 home triumph over Stabaek of Norway.

Jesper Gronkjaer put the Danish outfit ahead after 11 minutes and Cesar Santin doubled their advantage four minutes before the interval. Palmi Palmason pulled one back just before the hour for the visitors but Santin's second, from the penalty spot, re-established Copenhagen's two-goal cushion 10 minutes from time.

Tony Mowbray was handed a harsh dose of reality in his first competitive game as Celtic boss as Alexander Kokorin's seventh-minute strike earned Dinamo Moscow a 1-0 win at Parkhead.

Goals from Nenad Mirosavljevic and substitute Marcin Zewlakow saw APOEL sink Partizan Belgrade 2-0 in Nicosia.

Grigori Chirkin's long-range 64th-minute effort earned Latvian champions Ventspils a slender 1-0 home win over BATE of Belarus, while Leandro's 70th-minute strike was enough to see Hungarian champions Debrecen triumph by the same margin against Levadia in Tallinn.

Finally, the match between Salzburg and Dinamo Zagreb is finely poised after a 1-1 draw in Austria, while there will also be all to play for in the Czech Republic next week following a goalless first leg between Sheriff of Moldova and Slavia Prague.