Head Coach John Fox said that Ball began feeling the effects of appendicitis Sunday. The symptoms persisted into Monday morning, at which point he was sent to see a doctor, who made the diagnosis.
"It didn't (rupture)," Fox said. "It was really a blessing that we caught it now. He'll have the procedure immediately and he'll start the healing process."
Before going into surgery, Ball tweeted a message to his followers:
I appreciate the get well wishes everyone! I will be ok and come back stronger than ever!! #Broncos— Montee Ball (@ballrb28) August 4, 2014
A full recovery to playing availability within a month is now typical of the procedure, which has grown less invasive over the years.
Fox didn't want to guarantee whether Ball would have the No. 1 job awaiting him upon his return.
"I'm not into predicting the future, but he's really grown a lot as far as his understanding of the offense and execution of all parts of his job," Fox said. "Knowing the kind of guy that he is, he'll work at it, mentally he'll stay on top of his game."
In the meantime, Ball's absence will be felt, nowhere more than the running backs' meeting room.
"We're going to miss him a lot, and hey, you've got to step up," said running back
"But we're going to miss (Ball) a lot. He's like a brother."