Henderson returned to the starting line-up for a league match for the first time in a month and admitted he was not prepared to give up his chance just because of illness.
"I was close to not playing. I had a bad stomach and was sick on Saturday night, which is unusual for me," he said.
"I caught the bug a few people and the boss got, but I love playing football and I want to play every chance I get for this club.
"There's a lot of competition for places, so when you are given the opportunity you can't let anything get in the way. So I was pleased to be able to play.
"The coaches just said to me see how I felt in the warm-up. I felt okay so I managed to play for an hour which I'm pleased with."