Broja ended up scoring in the first-half as Chelsea won 2-0 on Monday night.
Pochettino said before kickoff: "Raheem Sterling didn't train in the last three days because of a virus.
"That is why we play with Armando. He's ready.
"Maybe we don't know if he can play 90 minutes. Hopefully he can deal with the competition after a long period [out]."