Captain Jonathan Douglas was caught on the ankle by a late and high tackle by Gary Cahill while David Luiz needlessly body-checked substitute Jake Reeves as the npower League One side finished beaten and bruised.
Chelsea manager Rafael Benitez saw nothing wrong with the challenges and Rosler was still to see replays of the incidents. Luiz apologised afterwards to Reeves, who suffered concussion in the incident.
Rosler said: "The player (Luiz) came into our dressing room, he spoke to Jake. I think that's a fantastic gesture.
"Jake Reeves is fine. He wanted to continue but our medical staff said it's better not to. He will be okay next week."
On Cahill's tackle on Douglas, Rosler said: "I saw it in a split second. My first reaction was no complaint."
Rosler had no complaint either when Marcello Trotta had an effort ruled out after 39 minutes, Swarbrick having already blown for a Luiz foul on Adam Forshaw.
"On a better day he (Swarbrick) could've waited one or two seconds and we would've been 1-0 up," added Rosler, whose attention now turns to Brentford's challenge for promotion. "Overall I would not complain about the referee. For me, the referee has not decided the game but with a little bit more fortune we could've had the lead. That is what you need in games like that."
Goals from Juan Mata, Oscar, Frank Lampard - his 199th for Chelsea - and John Terry ensured the holders a fifth-round clash with Middlesbrough.
Rosler added: "Rafa paid my players a lot of respect in putting out a very strong team. I didn't expect it. We had very good shape. At periods Chelsea were running out of ideas. The scoreline doesn't really reflect the game over big parts. We got too loose, too early. They punished us."
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