Leigh Griffiths has denied reports his absence from Celtic duty is due to a gambling problem or drug addiction.
Last month the Scottish Premier League champions announced Griffiths would be taking time away from the sport.
Manager Brendan Rodgers opted not to give details but said Celtic would support the striker through his issues.
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"We are going to give him all the professional help he needs to get him back in a good place," said Rodgers. "He's a great guy but football and life is tough for him right now.