By Neil Ashton Follow @@neilashton_ Mark Clattenburg is being investigated by referees’ chief Mike Riley after Southampton accused him of ‘abusing and insulting’ their captain, the England star Adam Lallana. Sportsmail can reveal that the extraordinary incident occurred in Southampton’s  2-1 defeat by Everton at Goodison Park last Sunday. Saints have written to the Premier League asking that Clattenburg is not appointed as an official for any of their matches until the investigation is over. Clattenburg has a controversial style and it is understood the alleged insult was directed at Lallana after the referee turned down Southampton penalty appeals late in the game.
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Mark Clattenburg under investigation after being accused of 'abusing and insulting' Adam Lallana
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Incident happened during Southampton's 2-1 defeat by Everton at Goodison Park
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Clattenburg declined Saints a penalty after Antolin Alcaraz handled in the penalty area
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Lallana argued with Clattenburg and heated words were exchanged
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Saints have asked that Clattenburg does not officiate another of their games until the investigation has been completed
Blocked: @placeholder's delivery struck the arm of Everton defender Antolin Alcaraz