Miroslav Radovic's second-half winner at Rapid Bucharest edged Legia Warsaw a step closer to the Europa League knockout phase after a 1-0 victory for the Romanian side.
The Serbian winger powered home a header 18 minutes from time to move second-placed Legia on to six points in Group C - still three points behind leaders PSV Eindhoven, who were 1-0 winners at Hapoel Tel Aviv.
The victory moved Legia three points clear of Rapid, with Hapoel bottom of the pile having collected no points from their three games.
The first half was a scrappy affair with both sides struggling to create chances.
Legia striker Danijel Ljuboja saw his header punched to safety by Rapid goalkeeper Danut Coman in the seventh minute.
Daniel Pancu drilled a 25-yard free-kick over the bar for the hosts seven minutes later.
Nicolae Grigore fired wide from close range in the 19th minute but Rapid were not testing Legia goalkeeper Dusan Kuciak.
Coman, at the other end, was required to catch a shot from Radovic three minutes later, and then had to be in the right place to tip a left-footed Ariel Borysiuk blast around the post.
Kuciak was called into serious action for the first time in first-half stoppage time, turning a long-range Ciprian Deac attempt out for a corner.
Deac continued his pursuit of the opener after the interval when he got another shot away, this time from inside the box, but Kuciak was again equal to it.
The game was switching from end to end, though, and Legia too were having sights of goal. Maciej Rybus fired over and Radovic had a speculative effort caught by Coman, but the warning was not heeded by the hosts.
The visitors were awarded a free-kick on the right in the 72nd minute for handball against Filipe Teixeira. Borysiuk swung in the set-piece and Radovic directed his header into the top-left corner.
The hosts had one opportunity to get back on level terms when Vladimir Bozovic sent over a stoppage-time free-kick, but Kuciak dealt with the danger to preserve his clean sheet and make sure of the points.