RENTON — Happy as Michael Robinson was to reclaim his familiar spot in the Seahawks’ locker room Tuesday, Marshawn Lynch might have had him beat.

“Marshawn almost cried when he saw Michael walk in,’’ said receiver Ricardo Lockette, who himself rejoined the team this week on the practice squad.

From his fullback position, Robinson helped pave the way for Lynch’s 1,590 yards last season and is now back in that role after the Seahawks announced Tuesday they had signed him for the rest of the season to fill in for injured Derrick Coleman and Spencer Ware.

“You miss Sundays, you really do,’’ said Robinson, who hasn’t played since being released by Seattle in the cutdown to 53 in late August. “It’s great to be back. Back in the locker room. Back to work.’’

It’s also great to be back healthy, Robinson said.

As he talked to reporters before Tuesday’s practice, Robinson revealed that the illness he suffered in late August was more serious than he realized at the time. Robinson said he began having a bad reaction to the prescription drug Indocin on Aug. 17, the day the Seahawks played their third exhibition game against Denver.

“(You’re) supposed to take it two times a day and I was taking it as prescribed, but I think I was dehydrated before the game and you can’t take those and be dehydrated,’’ he said. “And I think I probably got sick at the same time — they just said it was the perfect storm. I thought I was just getting the flu and, come to find out, liver, kidneys almost failed. It was pretty bad.’’

In fact, Robinson was hospitalized twice, the second time for “a few days.’’ He said he lost more than 30 pounds — down to 212 from his playing weight of 245.

His illness, combined with his $2.5 million salary and the presence of younger and cheaper players in Coleman and Ware, made Robinson expendable when it came time to set regular-season rosters despite the fact he was a special-teams captain the past two years and made the Pro Bowl in 2011.

Robinson said he had no hard feelings, saying, “I’m a realist. … You’ve been in this game eight years playing in the NFL, if you think there is loyalty in this game, that’s your fault — it’s a business.’’

He said Seahawks coach Pete Carroll and general manager John Schneider told him at the time that if there was a chance to bring him back, they would.

“They were very up front when they were cutting me, and they said, ‘Michael, we know there is going to come a point down the line when you are going to be healthy and we are probably going to need you, and if the opportunity presents itself we are probably going to come get you,’ ’’ Robinson said.

Robinson said it took him a couple weeks to get healthy and regain the weight he had lost. Once he did, he had tryouts with Tennessee and the Giants, but he said the Titans decided not to sign a fullback and that he didn’t like the situation with the Giants.

He was watching on TV last Thursday night when Coleman hurt his hamstring in the second quarter, leaving Seattle without a fullback. Coleman could be out four to six weeks, Carroll said. Ware has been out since suffering a high ankle sprain in the second game of the season against the 49ers and was put on the Injured Reserve list Tuesday.

Robinson said Schneider called Friday, and after a physical on Monday he rejoined the team Tuesday. He’ll reportedly make a prorated share of the $840,000 minimum for an eight-year NFL veteran.

Carroll said after Tuesday’s practice that he plans to have Robinson playing against the St. Louis Rams on Monday.

“I just want to be a part of it,’’ Robinson said. “I’m not trying to come in and do anything spectacular or whatever. I just want to come in and be the aggressive, physical guy that I am and be a part of the team and not try to do anything more.’’

Notes

• Carroll said WR Golden Tate was still sore Tuesday from shoulder/neck injuries suffered against Arizona, and his progress will be evaluated throughout the week.

• Lockette, who played in two games for Seattle in 2011, was added to the practice squad along with G Zach Allen, who played at North Carolina State. Seattle released WR Josh Lenz off the practice squad.

Bob Condotta: 206-515-5699 or bcondotta@seattletimes.com.

On Twitter @bcondotta