Arsenal face an anxious wait on captain Thierry Henry who last night aggravated injuries as he tried to drag his side into the Champions League quarter-finals at the expense of PSV Eindhoven.

The Frenchman began on the bench because of concerns over his fitness but his introduction late in the game backfired and he must now wait and see the extent of his injuries. He will undergo tests on his stomach muscle and groin today.

The striker had been sidelined for the best part of two weeks because of a troublesome hamstring and related back problem, as well as a foot injury, but manager Arsene Wenger now fears his talisman could be out for up to a month.

After the game manager Arsene Wenger said: "He got injured and he will be out for a few weeks. It is a different injury. He has torn his stomach muscle and his groin.

"It is sad for him. He's had a very difficult season."

Meanwhile, Freddie Ljungberg accepts Arsenal only have themselves to blame as another momentary lapse in concentration sent them crashing out of the Champions League.

The tie against PSV looked to be heading into extra-time last night, with the Gunners in the ascendancy having levelled the aggregate scores when Brazilian defender Alex netted an own goal.

However, disaster struck with just seven minutes left when Alexander Hleb conceded a needless free-kick on the left touchline, from which the defender - who is jointly-owned by Chelsea - made amends by heading the equaliser on the night to put the Dutch side through to the quarter-finals.

Ljungberg admits defending set plays once again proved their own undoing.

"We made a mistake and they scored. Again it was a bit nervy, and it is not the first time something like this has happened," the midfielder said. "You need to be disciplined.

"We spoke about not giving away any free-kicks before the game.

"We knew that they would defend and would not create a lot, so it was important not to give away any free-kicks, where they could put up Alex or people who can go up for the headers.

"We had to concentrate for 90 minutes and we did not so we were knocked out, which is very hard to deal with."

While third place in the Premiership remains very much a realistic goal for Wenger's men, the result will leave the club without a trophy for the second season running.