Fiat Chrysler (FCA) declined to comment.

Marchionne underwent an operation to his right shoulder, the carmaker said earlier this month, adding that a short recovery period was foreseen for the chief executive.

The 66-year-old, who also heads luxury carmaker Ferrari and serves as chairman at trucks and tractor maker CNH Industrial, is due to step down from his post at FCA in April next year.

(Reporting by Agnieszka Flak; Editing by Mark Bendeich)