Earlier, Hutchison confirmed that it was in exclusive talks to buy O2 for up to 10.25 billion pounds as Asia's richest Li Ka-shing makes his biggest bet to consolidate his European telecommunications operations.
The deal, which is subject to regulatory approval, will be funded using a 6 billion pounds bank loan, Sixt told reporters.
He added the group was reasonably confident of securing European regulatory approval for the transaction.
(Reporting by Denny Thomas)