The team struggled in their first season back in the top division, while Horsfield scored just three goals in 29 league appearances. His contribution on the final day of the season against Portsmouth however, proved vital to the club's survival. Coming on as a second-half substitute, he scored with his first touch, before setting up a goal for teammate Kieran Richardson. Combined with results from other matches, the 2–0 win ensured Albion's escape from relegation as the first club to survive in the Premier League after being bottom at Christmas. Horsfield said of the achievement, "Even though I have been promoted with every club I have been at this is the best moment of my career."