Plymouth Argyle's highest-profile signing of the summer has left the club "for personal reasons" less than a week after joining.
Liam Dickinson joined the club last week after being released by Barnsley at the end of last season.
"Regrettably, we have agreed to a request from Liam to be released," acting chairman Peter Ridsdale said.
The 25-year-old has also played for Brighton and Derby County and has scored 54 goals in his career.
"We fully understand the reasons why," added Ridsdale.
"Liam has been a thorough professional in the short time he has been with us, and we hope that things will work out for him," he added.