He played his club football with St Helens, with whom he had Challenge Cup and Super League grand final success, as well as the Wigan Warriors, Salford City Reds and Leigh Centurions.

[3] He began playing rugby at the local Blackbrook A.R.L.F.C., and was snapped up inevitably by St. Helens where he was hailed as one of Saints' brightest young hopes.

Having won Super League VI, St. Helens contested the 2003 World Club Challenge against 2002 NRL Premiers, the Sydney Roosters.

Jonkers found it tough to gain his place back in the team and subsequently joined the Salford City Reds on loan, before completing a permanent deal in 2005.

A recurrence of an injury to his knee, meant that Jonkers was forced to sit out most of his first season, and in March 2006, with first team opportunities scarce, he accepted a one-month loan deal with the Wigan Warriors to play under his former boss Ian Millward.