The Russian has struck in the past two games.
Schwarzer said: "Pavel's scored two very important goals for us and ever since he arrived his workload and commitment have been exceptional.
"With Pavel doing so well it's definitely eased the loss of Bobby. And if he keeps on scoring, it will help us to keep getting results.
"Bobby is a top-quality player and it's a shame to lose him. But these things happen in football and you just have to move on."