Celtic Park to help bankroll any splash on players. McKenzie is among the central defenders being closely monitored for the new term as boss Neil Lennon looks to replace Jozo Simunovic.
The 21-year-old has risen through the ranks of the American national set-up and was handed a first senior cap by his country five months ago after captaining his nation at the 2020 Under-20 World Cup in Poland.
McKenzie has sparkled for Union in the MLS since his debut in 2018 and can also operate in the left-back slot. The stopper, who hails from the Bronx in New York, has 18 months left on his current deal, but can be snapped up for less than £1million.
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