Kubiak collapsed at halftime of the Texans' game Nov. 3. It was determined he suffered a transient ischemic attack, also referred to as a "mini-stroke."
He took a leave of absence from the team and defensive coordinator Wade Phillips has acted as interim coach. Kubiak missed Sunday's game, which the Texans lost 27-24 to Indianapolis and saw their losing streak reach seven games.
Houston plays Oakland at home Sunday.
Kubiak attended practice Wednesday and also conducted his usual weekly news conference.
"It's great to be back on the field and getting back to work," Kubiak said. "I feel great today. I don't foresee any reason why I won't be [coaching Sunday]."
Fox said Tuesday in a conference call with Denver-area media from North Carolina where the surgery was carried out, Kubiak would return to Denver as soon as he was cleared to fly and that he set a goal of being on the Broncos' sidelines by the end of the season.