Sabres forward Kyle Okposo has spent the past three days in a Buffalo hospital undergoing a battery of tests to determine an undisclosed illness that has sidelined him for more than a week, according to multiple reports.

Buffalo's WGR-Radio first reported that Okposo was in the neurosurgical intensive care unit at Buffalo General Hospital earlier Wednesday before the Sabres played their home finale against the Montreal Canadiens.

"Kyle continues to be under the care of our doctors as he deals with symptoms from an illness," the Sabres said in a statement Wednesday night. "Out of respect to Kyle and his family, we will have no further comment at this time."

After Buffalo's 2-1 win over Montreal, several of Okposo's teammates expressed their support for him.

"We all care really much about Kyle,'' said Sabres forward Jack Eichel. "It's never easy to see him go through what he's been going through not feeling well. We just all want to be here to support him and wish him all the best. Hopefully he gets healthy soon.''

Sabres forward Kyle Okposo, right, had 19 goals and 26 assist in 65 games this season. AP Photo/Jeffrey T. Barnes

"You're family here,'' Sabres left winger Matt Moulson said. "And no matter what type of injury or what you have, you always feel for them and their family and giving them support.''

Sabres captain Brian Gionta said it has been difficult dealing with the uncertainty over Okposo's illness.

"We're coming down the stretch, we're trying to maintain some good stuff, get some positive energy going into next year and he's a big part of this organization, so it's tough,'' Gionta said. "He's a good guy in the room so he's missed for sure.''

Before Wednesday's game, Sabres coach Dan Bylsma would only say Okposo is with team doctors and that tests have yet to pinpoint the cause of the illness.

"As a coach and as a person, [I'm] very concerned for him in this situation," Bylsma said. "He's sick and dealing with that. It's a difficult thing for him to be dealing with right now in this situation."

Okposo was sidelined for a few hours before Buffalo's game against the Columbus Blue Jackets on March 28. He had just returned to the lineup and played two games after missing 10 contests because of a rib injury.

He is fourth on the team with 19 goals and 45 points in 65 games.

Okposo is competing in his first season with the Sabres after signing as an unrestricted free agent to a seven-year, $42 million contract in July. The 28-year-old is a three-time 20-goal scorer who spent his first nine NHL seasons with the New York Islanders.

The Sabres have been eliminated from playoff contention and close out the season on road against the Tampa Bay Lightning on Sunday.

The Associated Press contributed to this report.