The two drivers, Fernando Alonso and Kimi Raikkonen, flanked team chief Alberto Mattiacci, behind a sign reading "Forza Jules" (Go Jules).
The gesture came on Sunday, shortly before the inaugural Russian Grand Prix.
Bianchi suffered a severe head injury when his Marussia car skidded off the wet course at Suzuka and ploughed into a tractor recovering another car that crashed out at the same spot one lap earlier. His condition is critical.