Experts say the Canadian military is facing an institutional 'crisis' in the wake of twin military police probes launched into its current and former chiefs of defence staff.

The spokesperson said that Sajjan had become aware of the allegations 'a number of weeks after Change of Command,' but did not specify any exact dates.

Adm. Art McDonald and Gen. Jonathan Vance are facing military police investigations amid what experts call a 'crisis' for the Canadian Forces.

Chief of Defence Staff Adm. Art McDonald stepped aside after a military police probe opened on Wednesday, while Gen. Jonathan Vance also faces an investigation.

Former chief of defence staff Gen. Jonathan Vance is facing allegations of inappropriate behaviour with two female subordinates, including while he was in the top post.

The MPs say Harjit Sajjan has not answered questions or confirmed details reported by Global News of when he first became aware of the allegations against Vance.

The probe's expansion comes as a result of Global News' reporting on Sunday, which saw Maj. Kellie Brennan, one of the women behind the allegations, share her story.

Two government sources have told Global News that Gary Walbourne raised concerns about Gen. Jonathan Vance to Defence Minister Harjit Sajjan in 2018.

Experts like MacKenzie say there is a pattern of failure to stop sexual misconduct in the ranks that ultimately leaves service members still at risk.

Gen. Jonathan Vance denies the allegations of inappropriate behaviour and says he has been a "champion" and "friend" to Maj. Kellie Brennan.