Rangers will take on Old Firm rivals Celtic at Ibrox in the Scottish Premiership game on Saturday afternoon.
Scotland international midfielder Brown is likely to start the match for the Bhoys, who are favourites for the game.
The 32-year-old has been on the books of the Hoops since 2007 and knows what to expect from a Old Firm game.
The former Hibernian star will be an important player for Celtic, and ex-Rangers full-back Numan has warned Pedro Caixinha’s side about him.
Numan has also said that it will take Rangers a while to compete with Celtic for the Scottish Premiership title.
Brendan Rodgers’s side won the league title last season, as well as the Scottish League Cup and the Scottish Cup.
Celtic progressed to the group stage of the Champions League last season as well, just as they have this campaign.
“Celtic have Scott Brown in midfield and he’s an experienced player who knows exactly what to do against Rangers so it’s important for the Rangers players to keep calm and stay focused,” Numan told The Glasgow Evening Times.
“They must not take the bait and get involved, especially the Latin American players who tend to have that passion.”
"I hope that within two to three years we can compete with Celtic again, but I still have my doubts about that,” Numan told BBC Sport.