The veteran former Wales international was charged by the Rugby Football League's match-review panel after striking out at Leeds forward Carl Ablett during the Wolves' 40-20 qualifying play-off win over the Rhinos on Saturday.
Briers was charged with a minor grade A offence, which enabled him to avoid any suspension by making an early admission of guilt.
Warrington will be at home in next Thursday's first preliminary semi-final against one of the winners of this week's sudden-death play-offs.
Catalan Dragons hooker Eloi Pelissier also avoided a ban after admitting foul play during his side's 14-4 play-off defeat at Hull.
- Sports & Recreation
- Rugby Football League
- Carl Ablett