Plymouth Argyle striker Marvin Morgan is in hospital awaiting the results of medical tests after falling ill during a training session on Tuesday.
The 31-year-old's tweets have thanked the club's physio Paul Atkinson and others for 'saving my life,' and talked of a 'very scary day.'
A club spokesman said: "Marvin was taken ill during training at Home Park on Tuesday morning. He and the club are now awaiting the results of medical tests to determine the cause."
Morgan joined Argyle last summer following his departure from Shrewsbury and has played 23 times this season.