The halfback's availability for Saturday's clash at CommBank Stadium had been under a cloud, with his wife Kayla due to give birth to the couple's second child imminently.
But the Warriors confirmed on Friday night that Johnson would take his place in the side and follow Simon Mannering, Stacey Jones, Manu Vatuvei and Ben Matulino in reaching 200 games for the club.
Logan Swann played 201 games between stints with the Warriors and their predecessor side Auckland.
Johnson's milestone comes after a startling return to form.
In the second year of his second stint with the Warriors, the 32-year-old is playing as well as at any point in his career and has the New Zealand outfit eighth on the ladder through 18 rounds.
Johnson's Warriors teammates Dylan Walker and Addin Fonua-Blake will also celebrate milestones against the Eels, bringing up 200 and 150 NRL games, respectively, while hooker Wayde Egan reaches 100 games.
"My family is pretty excited and rightfully so," Walker said.
"They've been with me every step of the way. This weekend's not just about me, we've got a few others."
Fonua-Blake looked forward to celebrating alongside Walker, with whom he played junior football at Mascot in Sydney's south.
"He was a bit of a local gun in the area we grew up," Fonua-Blake said.
"He's done it all. Won a grand final, played for Australia, played Origin. Just to be part of his milestone, I'm pretty lucky.
"You don't get to play too many NRL games with people you've grown up with. I'm really happy I get to lace up the boots and go out there with him."
Walker was equally pleased.
"It's pretty cool, I've known Adds since we were eight or nine years old," he said.
"We went to the same high school, and when he got his shot at Manly we played a lot of football together there too."
The Warriors are coming off a tough 28-6 loss to the Rabbitohs in round 18, an experience Walker says will inspire them against the Eels.
"Last week, South Sydney just showed us how to play tough, finals football. Kicking in corners, defending well. Suffocation football," he said.
"They taught us a lesson and we took a lot out of it ... they just stuck at it longer than us.
"To right our wrongs this week we're probably going to use the same mentality they had."
Walker isn't reading much into Parramatta missing key players Mitch Moses, Reagan Campbell-Gillard and Clint Gutherson, who have all been included in NSW's side for next week's final State of Origin match.
"We had the same situation last weekend a bit against South Sydney," Walker said.
"But teams like that, when they've been so successful for a number of years, it's ingrained in their culture and what they're about.
"We're not taking anything lightly."
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