|15/4||Olivier Giroud is 15/4 with BetVictor to be Arsenal's first goalscorer against Man United on Sunday|
Wenger has relied solely on Olivier Giroud in the Premier League this season, with Arsenal having built up a five-point lead at the top of the table, while Nicklas Bendtner's outings have largely been limited to the Capital One Cup.
But Gazidis concedes that France international Giroud cannot shoulder the burden of playing every league game himself this season.
"We will see where Arsenal will be in January and whether or not the club will invest in another forward," he told L'Equipe.
"Olivier Giroud won't be able to go on all alone until the end of the season. We need to buy."
The Gunners travel to Old Trafford to face Manchester United on Sunday.