The Warriors announced on Monday that Metcalf will stay in Auckland until at least the end of the 2026 campaign.
The 25-year-old had struggled to make a breakthrough at previous clubs Manly and Cronulla, but contributed six tries in 12 NRL games en route to the Warriors reaching last year's preliminary final.
"I always just wanted someone to show me a bit of love and back me as a player," Metcalf said in a club statement.
"I have to put the hard work in myself but when 'Webby' had that chat with me and let me know, 'Hey we want you here long term', I knew in my heart extending here is what I wanted to do.
"I can't wait to re-pay the faith they've shown in me.
"I grew up idolising Shaun Johnson and now he's my teammate ... We're building something pretty special here."
Metcalf's new deal follows that of hooker Freddy Lussick, who has also extended his time at the Warriors until the end of 2026.
Webster now has a surfeit of playmaking options at his disposal with Te Maire Martin and Chanel Harris-Tavita starting the 2024 season in NSW Cup.
Johnson has yet to indicate whether he will play on after this year, with the veteran playmaker unlikely to make a call until later in the season.
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