Arsenal manager Mikel Arteta has revealed Alexandre Lacazette was not 100 percent fit and could not start against Brighton on Tuesday night.
The Frenchman was the only change made from the side that beat Chelsea 3-1 on Boxing Day, giving way for captain Pierre-Emerick Aubameyang, who started on the bench against their London rivals.
He however came on in the second half and scored just 21 seconds of his introduction to give the Gunners a 1-0 win, their second successive victory.
Arteta, who spoke after the game, revealed Laca was suffering from a sore back and could not be included in the starting lineup.
"Yes [he had a sore back] but he finished the game against Chelsea with some pain," said Arteta.
Adding; "We had the opportunity to refresh that and use him as well in other moments. We knew Auba could last for 90 minutes, we knew that Gabi wasn't going to last for 90 minutes for sure, so we had a substitution there and someone with a goal threat that we believed was going to be needed,"
The Gunners have been through a rough time in the Premier League, with their first win since early November coming at home against Frank Lampard's side.
Their second win against Brighton though pushed them to 13th on the log on 20 points and could end 2020 on a high as they visit West Brom on Saturday.