Arsenal are looking for a player to take them to the "next level" in the January transfer window after losing Gabriel Jesus to injury, says manager Mikel Arteta.
The Gunners entered the World Cup break five points clear of champions Manchester City at the Premier League summit, leading some to tip them as contenders for a first top-flight title since 2004.
Striker Jesus has played a key role for Arsenal this season, but he underwent surgery earlier this month after suffering a knee injury during Brazil's World Cup campaign.
With reports suggesting Jesus could be absent for three months, Arteta is targeting reinforcements – though he will only move for the ideal player.
"I never gave a date on Jesus – it will take some time, for sure. He's gone through surgery," Arteta said at a press conference to preview Monday's meeting with West Ham.
"We have to be active, we're looking to strengthen the team. This squad does not have the luxury of not maximising every transfer window.
"It has to be the right player. We need a player that will have an impact and take us to the next level.
"We know where we are in terms of the squad and numbers. We'll be extremely cautious about what we want to do in the window."
Arteta also revealed he had face-to-face contact with the club's hierarchy during the World Cup break, in order to plan for what will likely be a congested second half of the season.
"We are always connected, and that relationship is getting stronger and stronger. It's a very special relationship right now," he said.
"The ambition is there so it's very positive to spend time together. It was spare time, so it was useful to do it in that period.
"We've done our work but the second part of the season will be very different. Matches will come very fast with big congested periods so we have to have a fit, healthy squad to maintain the level that we want.
"There are new coaches and new owners around, so the window will be interesting and we have to be active on it too."
Boreham Wood earn vital point in survival fight with Rochdale stalemate
Boreham Wood nudged closer to National League safety after settling for a goalless draw at mid-table Rochdale.
The visitors headed into the game on the back of two straight wins that had taken them to the brink of safety and knew victory would lift them out of the bottom four.
Rochdale had the better of the first-half chances with D’Mani Mellor twice coming close, while Ryan East rattled the crossbar on the half-hour mark.
Boreham Wood grew into the game and had their best chance midway through the second half when Lee Ndlovu just failed to convert after home goalkeeper Jacob Chapman spilled the ball in the box.
Wealdstone not safe yet after late loss to Eastleigh
Wealdstone require just a point from their final game at Oldham on Saturday to mathematically secure National League safety after Chris Maguire’s 88th-minute strike earned Eastleigh a 1-0 win.
Maguire bent a superb free-kick over the head of Stones goalkeeper Marcus Dewhurst to seal his side’s third consecutive win.
Wealdstone also went into the game in fine form and threatened to claim an early advantage as Nathan Ferguson came close before Aaron Henry hit the bar direct from a corner.
But Eastleigh recovered and Maguire missed an opportunity to put the visitors in front before he rifled home the winning free-kick with two minutes left.
Kylian Mbappe bags brace as PSG stun Barcelona to reach Champions League semis
Kylian Mbappe scored twice as Paris St Germain came from two goals down on aggregate to stun Barcelona and reach the semi-finals of the Champions League.
Trailing 3-2 from the first leg, the visitors faced an uphill struggle when Raphinha scored the opener for Barca.
But the match turned when Ronald Araujo was sent off for a professional foul and goals from Ousmane Dembele, Vitinha and Mbappe’s double gave PSG a 4-1 win on the night and a 6-4 aggregate victory.
Barca took the lead, and gave themselves a two-goal cushion in the tie, in the 12th minute after superb work from Lamine Yamal.
The 16-year-old collected a pass on the right and ran at Nuno Mendes before a nifty piece of skill took him past the Portugal full-back.
Raphinha, who scored twice in the first leg, did not know much about his third of the tie as it ricocheted in off his shin four yards out.
The hosts almost had a second when Raphinha’s cross was only cleared to Robert Lewandowski, whose shot just went over the crossbar.
PSG remained a threat, though, and Marc-Andre ter Stegen had to make a smart save low to his left to keep out Mbappe’s close-range effort.
The drama came in the 29th minute when Araujo was shown a straight red card after he barged Bradley Barcola over on the edge of the area.
The Spaniards protested furiously that Pau Cubarsi was a covering defender, but after a VAR review, the decision stood.
Ten minutes later PSG were level on the night when Barcola whipped in a low cross which eluded Mbappe but was emphatically finished by Dembele at the far post.
After the break Vitinha collected the ball 25 yards out and, with no defenders closing him down, rifled into the net.
Ilkay Gundogan shaved a post for Barca but their night was about to take another turn for the worst when, first, boss Xavi was shown a red card for his angry reaction on the touchline.
Moments later PSG had a penalty when Joao Cancelo slid in and brought down Dembele, and Mbappe duly dispatched the spot-kick as the Ligue 1 side went ahead in the tie.
Barcelona staged a late rally but Gianluigi Donnarumma saved brilliantly from Lewandowski and Raphinha fired wide.
And in the last minute PSG broke forward and Mbappe lashed in the fourth to seal a stunning win.
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