Arsenal defender Ainsley Maitland-Niles has suffered a "small fracture" to his left leg and will be out for six to eight weeks, Arsenal have announced.
Maitland-Niles, 20, had been expected to a regular in the first-team squad this season following a promising previous campaign.
However, after suffering the injury during the first half of the opening Premier League match against Manchester City, Maitland-Niles could now be set for up to two months of rehabilitation.
Arsenal lost 2-0 against champions City in new head coach Unai Emery's first league game in charge.
The Gunners head to Chelsea on Saturday, and provided an injury update on Thursday morning, ahead of Emery's scheduled press conference.
Arsenal reported left-back Nacho Monreal and Danny Welbeck were both "in full training", so should come into contention for the trip to Stamford Bridge.
Defender Carl Jenkinson is, however, also expected to be out for six to eight weeks after he "sustained a significant sprain to his right ankle", the club confirmed, which is likely to mean the player will not be leaving on loan to a Sky Bet Championship club.
Sead Kolasinac should return to training from his knee problem in October, while club captain Laurent Koscielny continues his recovery from Achilles surgery.
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England's World Cup campaign has seen them climb to sixth place in the FIFA rankings with Germany tumbling from the top to a lowly 15th.
Gareth Southgate's side have jumped six places after England ended a 28-year wait for a World Cup semi-final appearance in Russia last month.
England beat Colombia and Sweden in the knockout stages before losing to Croatia in the last four.
France have risen seven places to top spot after winning the World Cup for the second time, under Didier Deschamps.
Belgium move up to second after making the last four in Russia and Brazil drop one place to third.
Argentina drop six places to 11th but the biggest losers are 2014 world champions Germany.
Joachim Low's side have slumped 14 places after losing to Mexico and South Korea in Russia and failing to make the knockout stages of the tournament.
Wales have fallen one position to 19th, with Northern Ireland up two places to 27th. The Republic of Ireland and Scotland also went up two spots to 29th and 40th respectively.
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