Arsenal has lost its aura since Arsene Wenger left in 2018.
Bischoff, now playing his football with Bahlinger in Germany, remains a fan of the Gunners and still watches every game when he can.
But the 32-year-old, who was born in France but represented Portugal at Under-21s level, says the things now feel very different without Wenger at the helm.
“Of course I still follow Arsenal,” Bischoff told Goal in an exclusive interview.
“Every week I watch Arsenal and see how they do. But now [under Unai Emery] is not like it was 10 years ago. For me, Arsenal without Wenger is not the same.
“Arsenal without Wenger is not Arsenal.”
A poor start to the season has seen pressure build on Emery, with his side sitting sixth in the Premier League - eight points adrift of the top four.