England full-back Stefan Ratchford has committed his future to Warrington until November 2020.
Ratchford, 28, has played 160 times for the Wolves since making his debut in 2012, scoring 550 points.
The former Salford man told Warrington's official website: "I'm delighted to get this over the line.
"I was heading into the last year of my deal next year and didn't know what was to happen so I'm delighted that the club has chosen to extend my contract.
"This is my sixth season here and I'm really enjoying myself. The results and performances have been disappointing this year for the standards we set ourselves but if you look at the squad we know what we are capable of."
Coach Tony Smith said the deal was a reward for Ratchford's hard work.
"I'm delighted for Stef on his extension," he said. "He has been very consistent this year and has earned the right for a longer term deal.
"He was already on contract for next year but is mature enough, with the right sort of temperament for us to extend his contract further.
"He works hard and is a good leader within our group.
"This is a nice reward for a lot of hard work and for how professional he is on and off the field."
