While widespread reports suggested that Sarri would rest Hazard on Thursday evening, the Belgian was pictured en route to Belarus with the rest of his team-mates.
The Blues have all but secured progression from Group L so Hazards inclusion will come as a surprise to many.
Sarris men host Everton at Stamford Bridge this weekend and the forward should be ready to start barring another injury on Thursday night.
Asked about Hazards fitness prior to Chelseas 3-1 win over Palace, Sarri told Sky Sports: I spoke with the doctor yesterday and he said he is doing better but hes not ready to play for 90 minutes.
So we decided altogether for the bench.
I think its very important for us to have him on the bench for the last 30-35 minutes, if necessary.
Olivier Giroud is expected to feature against BATE Borisov after a leg injury kept the striker out of Chelseas victories over Derby and Palace.