The 22-year-old is entering his third season in the IndyCar Series but first with Arrow McLaren, having been added to its 2024 line-up following the contract fallout drama surrounding Alex Palou.
According to a team representative, Malukas sustained the injury while “biking out west”.
Although a fracture has been confirmed, the current plan is for him to undergo an operation on Tuesday afternoon.
It is not known at this time if the Chicago-born Lithuanian-American be sidelined for any races to start the year.
“From there we'll have a better understanding of a recovery window,” the team representative said.
Arrow McLaren signed Malukas to drive its No. 6 Chevrolet after two-time champion Palou opted to remain with Chip Ganassi Racing, breaking a previously agreed contract with McLaren.
Malukas spent each of the past two years driving for Dale Coyne Racing with HMD Motorsports, scoring two podiums both at the St. Louis oval previously known as Gateway.
Speaking in October, he revealed there was still an element of surrealness to his big move to join Pato O'Ward and Alexander Rossi in the third car raced last year by new Meyer-Shank Racing signing Felix Rosenqvist.
Source: Autosport