Johnson, 26, has missed the last five matches since going off with a ligament problem in the loss to Penrith on last month.
He will resume his halves partnership with Kieran Foran against the Sea Eagles at Mt Smart Stadium on Sunday.
Foran left the field with a back injury in the 36-18 loss to South Sydney last Friday night, but has been named to play his former club.
As well as welcoming back Johnson, coach Stephen Kearney has Ben Matulino back on deck after the prop completed a one-match suspension.
Matulino's return offsets the loss of veteran Jacob Lillyman to a season-ending bicep injury suffered against the Rabbitohs.
Wing David Fusitu'a, the side's top try scorer with 10, is set to make his 23rd appearance of the season - the only Warrior who hasn't missed a game this year.
The Warriors, who are 13th on the table and out of play-off reckoning, are looking to snap a seven-match losing streak which began with their defeat to Manly in Perth in early July.
The Sea Eagles are also looking to arrest a form slump, after just one win in five, which has dropped them to eighth and put them in danger of missing out on the finals.