INDIANAPOLIS -- For many Hoosiers, Donald Trump may now have received the three biggest endorsements he could get: Bobby Knight; Gene Keady and Lou Holtz.

Keady, who spent 25 years as men's basketball head coach at Purdue University, joined Trump on stage Monday at a rally at The Palladium in Carmel, Indiana.

Keady was the winningest coach in Purdue's history, and the second winningest in Big 10 Conference history – only behind former Indiana University men's basketball head coach Bobby Knight, who endorsed Trump last week.

In a rally at the Indiana State Fairgrounds, Knight told Trump supporters the New York billionaire was the "most prepared man in history" to be president.

WATCH | Bobby Knight endorses Donald Trump for president

Trump also announced Monday that former Notre Dame head football coach Lou Holtz had endorsed him as well.

Trump's campaign posted a video to his official Twitter account of Holtz explaining why he was endorsing the real estate mogul.

"The main reason I'm endorsing him is: I've played in his golf course. I've stayed in his hotels. He does nothing but first-class in everything. He wants this country to be first-class as well."