The NFL has postponed Sunday's game between the Tennessee Titans and Pittsburgh Steelers to either Monday or Tuesday.

The postponement follows positive COVID-19 tests among the Titans from four players.

Mike Vrabel said Wednesday that some of the players who tested positive were experiencing flu-like symptoms.

"I know there's going to be a lot of questions about the game and about who's to blame and where it started. Nobody's to blame. We're in a pandemic," Vrabel said. "... This is a very unfortunate situation, but one that we're confident that we will be able to handle safely with the football team and the players' best interests in mind."

The NFL intends to play this weekend's Tennessee Titans-Pittsburgh Steelers game despite the fact that the Titans won't reopen their facility until at least Saturday after eight members of the organization tested positive for COVID-19.

While playing on Sunday remains the goal, the league has a contingency plan is in place to move the game to Monday night.

The NFL intends to play the Week 4 game between the Tennessee Titans and Pittsburgh Steelers in Nashville despite three players on the Titans testing positive for COVID-19.

Five personnel members have also tested positive for COVID-19.

One of the contingency plans to allow for additional testing and contact tracing to occur would be to move the game to Monday night.

"This is not unexpected," NFL commissioner Roger Goodell wrote Tuesday to the chief executives and presidents for every team in a memo, which was obtained by ESPN. "There will be players and staff who will test positive during the season."

James Conner is prepared to be the bell-cow back for the Pittsburgh Steelers this season, but the plan hit a roadblock on Monday night.

Conner left early in the second quarter with an ankle injury. He was listed a questionable to return, but never returned to the field.

Benny Snell took over for Conner and carried the ball 19 times for 113 yards.

Ryan Shazier has officially announced his retirement from the NFL.

"When I was 5 years old, I made the greatest discovery of my life," Shazier said in a video posted to Twitter on Wednesday. "I discovered the game that I love -- the game of football. Ever since then, I've given my life to the game. I love everything about it ...

"Football gave me everything I ever wanted and more. It taught me about hard work, dedication, teamwork. It took me to college and the NFL. It made me money and gave me a life most people could only dream about. I'm here today to make sure the world knows how much I still love football, how grateful I am for everything football gave me. And I'm here to let the world know that today, I am officially retiring from the game I love so much."

Shazier was rushed to a University of Cincinnati hospital on Dec. 4, 2017, after a tackling attempt against the Cincinnati Bengals on Monday Night Football left him struggling to move.

Shazier underwent spinal stabilization surgery a few days after, and he didn't regain movement in his legs until the following February.

"To lose the game in a way I never envisioned has not been easy," Shazier said in his video. "When you play the game of football the way I did, you convince yourself you're Superman. That nothing can stop you, but then the moment I got hurt, I stopped being Superman. That was difficult to make sense."

Mike Tomlin is making it clear that James Conner will be the clear No. 1 running back for the Pittsburgh Steelers.

"There is no question about who our bell cow is," Tomlin said. "Our bell cow is James Conner, and he is our primary ball-toter."

Conner dealt with injuries last season, costing him six games and parts of two more. However, the running back had nearly 1,500 total yards and 13 touchdowns in 2018.

The Pittsburgh Steelers and Cam Heyward have agreed to a four-year, $66.5 million contract extension.

The $16.4 million average over four years is the richest contract in NFL history for a defensive player over 30.

Heyward made All-Pro twice in the past three years, including last season when he set his career high in tackles with 83.

Ben Roethlisberger's contract runs through the 2021 season, but the Pittsburgh Steelers are open to extending the quarterback's deal beyond that.

"Obviously after the season we'll evaluate his contract situation along with other contract decisions we have to make," Art Rooney II said. "But if Ben feels like playing longer and it looks like he's capable of doing it, certainly that would be a great scenario."

The Steelers are encouraged by what they've seen from Roethlisberger in training camp. He missed the final 14 games of the 2019 season after having significant elbow surgery.