Tuesday, he was in Springfield to promote the Shadow Buddies program that the Chiefs have been a big part of for years.
The Shadow Buddies program provides dolls that go to seriously ill children in hospitals.
The Shadow Buddies have the same illnesses that the children have, so it helps these kids cope.
Former Chiefs tight end Tony Gonzalez help start the program in K.C..
Now, Matt Cassel helps promote Shadow Buddies.
He, along with Southern Bank presented Shadow Buddies with a check for $1,000.
Cassel says he's healthy and ready to go for the upcoming season and is proud of his work with Shadow Buddies.
"We're able to go and do a lot of hospital visits and meet different kids with different illnesses," said Chiefs quarterback Matt Cassel. "And a whole different range of things going on in their lives. To bring a smile to the kids face, to meet their family, shake hands and really interact. That's what it's all about to me."