Gloucestershire batsman Hamish Marshall has been ruled out for a month after breaking his right thumb.
The former New Zealand international, 32, was hit by a delivery from Toby Roland-Jones in their Division Two match against Middlesex last week.
"Hamish is out for four weeks so we are an experienced batter down," captain Alex Gidman told BBC Gloucestershire.
"With Dentsy [Chris Dent] still injured we are down to the bare bones a bit but that's the nature of the beast."
He added: "We've been very fortunate in a way with injuries in the past couple of years, so we have to deal with these sort of things and move on."
Marshall was filling in as opener for Dent, who sustained a similar injury last month, but was forced to retire on Friday after the blow to his hand.
However, he returned to the crease as last man on Saturday as bad light forced the game to end in a draw.
Gloucestershire have made a solid start to the County Championship season, winning two and drawing one of their opening four games.
But their 100% record in the CB40 came to an end on Sunday with an eight-wicket defeat by Somerset.
"We knew that they were probably a better side than us on paper," added Gidman. "But I was a little bit disappointed with our performance in certain areas.
"We didn't execute out plans like we have been and we paid for them but it's a huge learning curve for all of us and after what's been a good start to the season it's probably brought us down to earth."