Sussex have confirmed that England all-rounder Michael Yardy will not be in their Twenty20 team for Tuesday's match against Somerset.
The 30-year-old returned home early from the 2011 World Cup in India in late March suffering from depression.
He began playing for his county again at the beginning of May.
"He's just taking some time out - whether that's a day, a week or longer, we don't put a timescale on it," Sussex cricket manager Mark Robinson said.
"He's done really well. He's had a busy period and he's taking the opportunity to make sure he keeps on top of it.
"He's got a condition which is very common. What he's doing is learning to understand it so he can continue to play the cricket he wants."
Murray Goodwin will captain the side in Yardy's absence and Robinson said the club were prepared for Yardy taking time out.
"We have to make sure we have things in place to make sure we can continue without him.
"But the main thing is to support the player."
Yardy's illness has prompted renewed examination of depression amongst top-class athletes, particularly in cricket.