Arsenal manager, Mikel Arteta, has confirmed that Gabriel will be out for “weeks”.
Gabriel picked up a thigh problem while playing for Brazil during the international break.
The 27-year-old limped off against Senegal and Arteta has described it as a “blow”.
Gabriel is set to miss the game against Tottenham, as well as the fixtures with Bayern Munich and Chelsea.
Arteta said: “Gabi unfortunately picked up an injury with the national team. He will be out for weeks.
“We need to have another scan next Wednesday.
“It’s clearly a blow., It’s our leader in our backline. To miss him is never a positive thing. The good thing is we have some very good options. They need to stand up now.”