Arizona Cardinals coach Bruce Arians was released from the hospital Monday night and returned home after feeling ill overnight, the team said.
ESPN's Adam Schefter reported that Arians was expected to return to work this week, possibly as early as Tuesday.
Arians was taken to the hospital because of chest pains, sources close to the situation told Schefter, but the team said test results "have come back favorably."
"After returning home from Minnesota, Cardinals head coach Bruce Arians was experiencing discomfort and not feeling well during the night. His wife took him to a local hospital to be evaluated," the Cardinals said in a statement. "All tests conducted so far have come back favorably. He remains in the hospital for continued evaluation."
The Cardinals canceled Arians' Monday news conference that was scheduled for 2:15 p.m. ET.
Cardinals wide receiver Larry Fitzgerald met with reporters instead of Arians on Monday and said he talked with the coach Monday morning. Arians told Fitzgerald he was "resting comfortably" and was "feeling better."
Cardinals defensive back Tyrann Mathieu tweeted that he had heard from Arians:
My guy BA just text me, he will be ok. #BuiltToLast— Tyrann Mathieu (@Mathieu_Era) November 21, 2016
The Cardinals lost 30-24 to the Minnesota Vikings in Minneapolis on Sunday.
In August, Arians was rushed to a San Diego hospital before a Cardinals preseason game against the Chargers, thinking he had a kidney stone. The Cardinals said Arians was suffering from complications from diverticulitis, an inflammation in the colon.
He spent the night in the hospital and was released the next morning.
Arians' health has been an issue throughout his career.
He gained 33 pounds during his first season in Arizona but lost about 15 in the first two months after the season. He began walking before practices during the 2013 season but hasn't been seen doing that in a couple of seasons.
He also underwent surgery for prostate cancer in 2007 while with the Pittsburgh Steelers.
When he was the head coach at Temple University, Arians said he was hospitalized for migraines, sometimes up to twice a week. He said the migraines stopped as soon as he was fired from Temple in 1988.
ESPN's Josh Weinfuss contributed to this report.