Over his last three games, Seager is hitting .533 with eight hits, three home runs and six RBI.
Meanwhile, infielder Yunel Escobar remains out with a hand injury. It will be the third straight game he has missed due to the issue.
Gosselin has not played since mid-May after undergoing thumb surgery. He was acquired from the Braves in June.
Both players were injured during Thursday's game and will be missing their second straight game with their injuries. The Nationals have not passed along any updates on their status, so they are both considered day-to-day at this point.
Johnson, who landed on the DL due to a spider bite infection, hit well with his new team before going down. He is batting .429 (9-for-21) since arriving in Cleveland. He had all but taken over as the starting first baseman with Carlos Santana moving to designated hitter.
Anthony Rendon will assume his position with Trea Turner playing second.
Escobar had been on a roll before going down with nine hits in his last 19 at-bats to sweeten his slash line to .308/.367/.423.
The 34-year-old Kouzmanoff has not played since April 2014. He was off to a brilliant start with Texas when two back surgeries ended his season and perhaps his career.
He remained on the bases, but left when his team took the field in the bottom of the inning.
X-rays taken of Escobar's hand came back negative, and he is considered day-to-day for now.