World number five darts player James Wade is recovering in hospital in Germany after withdrawing from the European Open on Sunday.
The Englishman has undergone tests for symptoms, including a beating heart, high blood pressure, nausea and dizziness.
Wade, 39, withdrew before his semi-final match against Dimitri van den Bergh and was taken to a hospital in Leverkusen on the advice of paramedics.
He is said to be comfortable and improving, but is under observation.
His wife Samantha can not come to visit as she is caring for their son Arthur and is also expecting their second child.
“It was very worrying Sunday to Monday night and it’s awful to think of James there alone when he’s been so bad,” she said.
“Obviously we want him home as soon as possible, but the medical staff have been fantastic with James and he is hugely grateful for the compassion and care they have shown him – we take their advice on when it will be safe for him to return home. “
Wade, from Aldershot, is a four-time semi-finalist in the PDC World Darts Championship, has won 11 major titles and is currently in third place in the Premier League.
“James is desperate to make sure he does not disappoint anyone and is already talking about returning to competition for people who have bought tickets,” his wife added.
“Even though it’s in his nature, I’m sure everyone will agree that it’s the most important thing that he gets a full recovery and we will take it day by day.”