The 27-year-old had said before Christmas it was unlikely he would return to the Hawthorns, feeling he has lost the trust of boss Roberto Di Matteo.
However, in a change of heart the Czech claims he is now determined to prove his commitment.
Bednar told the Express and Star: "I'm happy to be back and whether I played or not on Saturday wasn't important for me. I'm working hard and it feels like a fresh start for me.
"I chose myself that I want to stay. Everyone knows I love this club and I'm going to try to prove I should play.
"I'm happy to be here with the players and I'm working hard, that's what I promise."
He added: "I was pretty unhappy, and everyone saw that, before I left for the loan at Leicester. I have put my head straight. I had a good time at Leicester but I still feel like my place is here.
"I've got something left to prove. I love this club and I still want to be here. I went to see the gaffer and he said if I work hard I will get chances. That's enough for me."