"He is a top goalkeeper and one of the best in the league. He made two fantastic saves at the end," Derby coach John Eustace said after Saturday's 1-1 draw.
In mid-September, the Swede injured his knee and missed four consecutive league matches, as well as Sweden's four Nations League matches in the autumn.
"It's always tough not to play and not be able to train, but I've had a lot of help from the medical team, and the coaching team has helped me mentally," the 28-year-old told BBC Sport Derby after the match against Sheffield, in which he made ten saves.
Widell Zetterström started Sweden's last two matches at this summer's World Cup, where the team was eliminated in the round of 16 by France (0-3).
Derby are second in the Championship with seven points from 12 games.
