During the 2010 off-season, the Bulls signed power forward Carlos Boozer, who was expected to start at the beginning of the season rather than Gibson. But Boozer broke his hand before the pre-season, and Gibson started the first 15 games of the season. After Boozer's return, Gibson moved into a bench role for most of the season. He was selected as a starter for the Sophomore squad in the 2011 NBA Rising Stars challenge at the All-Star weekend, which the Rookie team won 148–140. Gibson played 18 minutes and recorded 8 points. At the end of the season, the Bulls made the playoffs as the first seed in the Eastern Conference. On May 10, 2011, Gibson helped his team take a 3–2 lead in the Eastern Conference semifinals against Atlanta, making all of his 11 points in the fourth quarter.