Perth Scorchers skipper Adam Voges will return home after suffering a calf injury which will rule him out of action for six weeks.
Voges tore his right calf muscle while jogging a single for Middlesex in the UK County Championship and was forced to retire hurt.
The veteran underwent scans which have shown the full extent of the injury, which will rule him out until late July, with a view to returning during the NatWest T20 Blast.
"Losing Adam is naturally a blow as he contributes significantly to everything we do," Middlesex director of cricket Angus Fraser said.
“Whether it be with bat in hand, catching at slip or his general presence around the team.
"His absence, however, does give opportunities to other players who are desperate to play in the first XI.
“In the past we have coped well without an overseas player and I expect us to do so now."Follow @ScorchersBBL on Instagram to keep up with how our players are performing in the off-season