Chicago White Sox
"He is coherent, is resting comfortably and is communicating with his doctors and medical staff," the White Sox said in a statement. "Reinsdorf will remain at Bassett Medical Center overnight as a precautionary measure and is expected to be released in the morning."
Reinsdorf, 78, has owned the White Sox since 1981. He also owns the NBA's Chicago Bulls.
Former White Sox slugger Frank Thomas is being inducted into Cooperstown this weekend, as is former manager Tony La Russa.