He described his coach as hard-working.
"His truck's always the first one here and the last one to leave," Watt said. "The guy lives for it, and he lives and breathes this game. He puts it all out there for us, and obviously we hope to get him back soon."
Kubiak is among a number of football coaches to suffer dramatic health issues recently.
Denver Broncos head coach John Fox was taken to a hospital Saturday after feeling lightheaded while playing golf, the team said, and he underwent "successful" surgery Monday to replace an aortic valve. He will be away from coaching for at least the next several weeks, the team said.
In September, University of Minnesota Gophers head coach Jerry Kill suffered an apparent epileptic seizure on a sideline at halftime, the sports website Bleacher Report said at the time.
Kill, who has a history of such seizures, has been on leave as head coach since October 10 but continues to be involved with the team while receiving treatment to manage his epilepsy, the school said in a statement.