Arsenal star Bukayo Saka is set to be ruled out until February, talkSPORT understands.
The winger pulled up in the 23rd minute with a hamstring injury immediately after firing in a low cross in the 5-1 win at Crystal Palace.
Saka clutched the back of his leg before going off injured
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Saka clutched the back of his leg before going off injuredCredit: Getty
Saka hit the deck, where he could be seen holding the back of his right leg, before he instantly signalled to the bench.
An Arsenal medic came to his aid, but the 23-year-old was unable to shake off the knock, and was swiftly replaced by Leandro Trossard.
talkSPORT reporter Ian Abrahams revealed on commentary duty that Saka looked emotional as he walked towards the tunnel, describing him as 'distressed'.
Saka had previously picked up a hamstring injury on international duty in October during England's defeat to Greece.
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He then appeared to tweak it again during his club's 1-1 draw with Chelsea in November.
The player was pictured leaving Palace's ground on crutches after the game on Saturday.
Now, talkSPORT understands the England star will miss at least five weeks of action.
By the end of January, Arsenal will have played ten games, which includes league showdowns with Tottenham, Aston Villa and Brighton, while their first match of February sees them take on reigning Premier League champions Manchester City.
Also in that run are two Champions League group stage games, Arsenal's FA Cup clash at home to Manchester United as well as the first leg of their Carabao Cup semi-final tie against Newcastle.
Arteta conceded after Arsenal's victory that he is concerned over the Saka's injury.
Arsenal have a number of important fixtures between now and February
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Arsenal have a number of important fixtures between now and February
An immediate signal to the bench proved to be a worrying sign for Gooners
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An immediate signal to the bench proved to be a worrying sign for GoonersCredit: Getty
He said: "We are pretty worried about Saka’s injury. He grabbed his hamstring and couldn’t continue. He will have to be assessed but we are pretty worried, yes."
Saka has started all but one of Arsenal's 17 Premier League matches so far this season.
The Three Lions forward has also started in five of the club's Champions League fixtures, along with one Carabao Cup fixture.
As he has been in previous campaigns, Saka has been Arsenal's standout player this term.
He has already chipped in with nine goals and 13 assists in all competitions - just 12 goal involvements off his tally from last season.
Saka looked in pain as he received treatment at Selhurst Park
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Saka looked in pain as he received treatment at Selhurst ParkCredit: Getty
The Hale Ender was pictured on crutches following the London derby
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The Hale Ender was pictured on crutches following the London derby
Saka looked emotional as he headed down the tunnel
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Saka looked emotional as he headed down the tunnelCredit: Rex
Saka would have been hoping to add to his tally at Selhurst Park on what was his 250th appearance for Arsenal.
Only Cesc Fabregas and David O'Leary have hit the landmark milestone at a younger age than Saka.
Arsenal's next match sees them take on Ipswich Town at the Emirates Stadium on December 27, live and exclusive on talkSPORT.