A sensational second half saw South Sydney Rabbitohs fight back to beat Parramatta Eels and secure a meeting with Penrith Panthers.
The NRL announced Michael Jennings returned a positive A-sample for banned substances Ligandrol and Ibutamoren.
Wigan Warriors and St Helens were Super League winners at Headingley, while Catalans Dragons were also victorious on Friday.
Three tries inside the opening 22 minutes helped Canberra Raiders defeat Sydney Roosters in a repeat of the 2019 Grand Final.
There were two hat-tricks at Headingley as Leeds and Salford followed up Challenge Cup semi-finals wins with Super League victories.
The South Sydney Rabbitohs came from 14-0 behind to win 46-20 against the Newcastle Knights in the NRL finals.
Melbourne Storm and Canberra Raiders claimed victories in the NRL finals on Saturday, although the former lost Cameron Munster to injury.
Penrith Panthers saw Nathan Cleary score 21 of their 29 points in a dramatic victory over Sydney Roosters.
The NRL is investigating allegations made against Sam Burgess, which the former South Sydney Rabbitohs player has denied.