"Like Willie, we're going to hold Trey out for the games in the Bahamas while he recovers from a medical procedure," he said via his UKCoachCalipari Twitter account. "Both Willie and Trey could probably play if they really wanted to, but I'm not taking a chance on either kid. I want them 100 percent for the start of our season, and there's no reason to push these guys before they are absolutely ready.
"Plus, this gives us a chance to play some of our other guys and get them some more work."
Cauley-Stein has been rehabilitating an ankle injury he sustained during UK's NCAA Tournament run. Lyles recently had to pull out of the annual Kentucky-Indiana All-Star series due to an illness that was causing extreme dehydration and fatigue, according to his father.
The 6-foot-10, 250-pound Lyles was rated the No. 1 power forward and No. 11 prospect overall in the Class of 2014. A likely replacement for the spot vacated by Julius Randlek, he's part of an incoming class that was rated No. 2 in the country.
With two of the Cats' main big men out of commission, UK will likely split most of the minutes between sophomore center Dakari Johnson, sophomore center Marcus Lee, junior forward Alex Poythress, sophomore forward Derek Willis and freshman forward/center Karl Towns Jr. That group would still be considered by many to be one of the top frontcourts in college basketball for 2014-15.
The situation may also allow Calipari to experiment with some three-guard looks with a deep group of backcourt players that will include sophomores Andrew Harrison Aaron Harrison and Dominique Hawkins, along with incoming freshmen Tyler Ulis and Devin Booker.
Kentucky will play six games against international squads on August 10-17 in Nassau. The Cats will also take advantage of 10 extra days of practice leading up to the event, which is permitted by the NCAA once every four seasons.
UK last participated in a foreign exhibition tour prior to the 2010-11 season when the Brandon Knight/Josh Harrellson-led Cats played in Windsor, Canada.