Prior to signing with the Rockets, Mensah-Bonsu, 26, averaged 5.1 points, 5.4 rebounds and 13.8 minutes in 19 games with the Raptors. He was signed as a free agent by Toronto on March 6, 2009. Mensah-Bonsu saw action in three contests with the San Antonio Spurs in 2008-09, averaging 5.0 points and 3.3 rebounds in 6.7 minutes. He appeared in 12 games with the Dallas Mavericks in the 2006-07 season where he totaled 29 points and 22 rebounds in 72 minutes. He also spent part of that season in the D-League with Fort Worth, averaging 15.8 points, 10.4 rebounds and 30.7 minutes in 26 games. He earned 2007 D-League All-Star Game MVP honours with 30 points and seven rebounds.
The native of London, England spent two seasons overseas, playing with Benetton Treviso in 2007-08 and DKV Joventut in 2008-09. He averaged 9.2 points and 8.3 rebounds in 31 regular season games with Benetton. He saw action in just two games with Jovenut before returning to North America to play in the D-League.
A four-year athlete at George Washington University in Washington, D.C., Mensah-Bonsu averaged 12.6 points and 6.7 rebounds in his senior season leading the Colonials to a 26-1 regular season mark and a Top 10 ranking.