Disciplinary proceedings have been initiated against the 22-year-old wicketkeeper-batsman by the Kerala Cricket Association (KCA) after he allegedly went out of the venue of the match without informing the team management.
He also allegedly broke a bat in the dressing room after a match. He returned to the venue in the evening after the team management made several efforts to contact him, KCA sources said.
Former Kerala players S Ramesh, P Ranganathan and Adv Sreejith are the members of the four-member enquiry committee headed by former KCA President T R Balakrishnan, a source said.
The panel will also probe the allegations that Sanju's father used inappropriate language against KCA office-bearers during a telephonic conversation, sources said.
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Sanju's father Samson, however, rejected the charges against his son.
"Sanju has not violated any discipline," he told a TV news channel.
The player has not reacted to the allegations against him.