Hampshire chairman Rod Bransgrove has admitted captain Shane Warne is likely to miss the club's Twenty20 campaign to address a shoulder injury.
Warne is set to return to Australia for treatment on his bicep, and quipped he was "too old for Twenty20 cricket."
Bransgrove told BBC Sport: "We knew about this at the start of the season and it is up to Shane to decide if he feels he has to go back to Australia.
"We want to resolve the problem, we see Shane as a long-term investment."
This year's Twenty20 competition begins on 27 June and the group stages run through to 11 July.
Warne did not feature at Hampshire's Rose Bowl when England played Australia in a Twenty20 match last summer.
He has only played in two matches of the shortest format of the game, bowling 48 deliveries and taking one wicket at a cost of 51.
The leg-spinner will return to the Rose Bowl for the remainder of the season, but Hampshire will not be allowed to bring in another leading overseas player during his absence.
Under England and Wales Cricket Board regulations, only overseas players who are away on international duty can be replaced.