All four players signed two-year contracts with the club.
Brouillette, from Montreal, is a six-foot, 230-pounder that recorded 21 defensive tackles and nine special teams tackles in nine games last season. The 25-year-old quarterback turned linebacker also saw time at safety for the Alouettes in 2011.
The six-foot-seven, 315-pound Bourke was named the CFL's 2011 Most Outstanding Lineman for the first time in his five-year CFL career. The Windsor, Ont., native's ability to protect quarterback Anthony Calvillo's blind side helped the Alouettes rank first in points scored, passing yards and points scored per game last season.
London, a six-foot-four, 210-pound import, had his best season in 2011, posting career-high numbers in receptions with 38 and in receiving yards with 475.
The six-foot, 195-pound Parker had three interceptions for the Alouettes in 2011. Parker also recovered two fumbles which he returned for a total of 20 yards. The 30 year-old was second on the team with 55 tackles in 2011 and has a career total of 143.