While the 2012-13 champions will be without Bayswater-bound paceman Denver D’Cruz, the side has picked up Netherlands all-rounder Mudassar Bukhari.
Olsen said club captain Michael Swart, who also represents the Dutch, talked the Pakistani-born cricketer into a summer of competition in Australia.
Bukhari has featured in 46 one-day internationals, 11 first-class matches and 27 T20s for the Netherlands.
The medium paceman was the hero of the side’s 45-run upset over the English at the World T20 earlier this year.
The 30-year-old claimed openers Alex Hale and Michael Lumb before dismissing number nine Stuart Broad to take 3-12 in a man-of-the-match effort.
He holds a one-day career high of 84 with the bat, which he scored against Canada in the 2009 World Cup qualifiers in South Africa.
The right-hander strengthens a Joondalup list Olsen said would change little from last season ” the main difference being the departure of D’Cruz who will captain Bayswater Morley.
The Centurions have retained WA rookie Jaron Morgan and can expect further development from promising 17-year-old Clint Hinchliffe.
Joondalup plays its first match of the season against Mt Lawley on October 4.