Wales captain Ryan Jones has been declared unfit for Lions duty and began his journey home on Friday, a day after joining the Lions in South Africa.
The 28-year-old's plight was caused by the head injury suffered in the first minute of Wales' 48-15 win over United States in Chicago on Saturday.
Jones joined the Lions on Thursday as Irishman Stephen Ferris' replacement.
But Lions head coach Ian McGeechan says no further replacement will be called up at this stage.