Rogic impressed against St. Johnstone, but has struggled since returning to Celtic from the World Cup.
Si Ferry has told Open Goal's 'Keeping The Ball On The Ground' that Celtic playmaker Tom Rogic has been "lacklustre" this season and ordered the Aussie magician to improve.
The 25-year-old starred alongside James Forrest at Perth on Sunday afternoon as Celtic beat St. Johnstone 6-0, with Forrest scoring four while left-footed ace Rogic adding three assists.
But before the triumphant win, Rogic had only managed two goals for the Hoops this season in 14 league and cup appearances without creating any goals for his teammates.
His form has been a big question mark since Rogic returned from the World Cup in Russia, with perhaps tiredness affecting his displays. Ferry believes he has been poor so far, and urged him to increase the level of his performances.
"If you can get Rogic back to his best, I think it makes a big difference," Ferry said. "Three goals I think he set up. After the World Cup, I think he's been poor. Think he's looked a bit lacklustre, maybe he's had a wee injury or needed a wee rest."
Celtic currently sit third in the Scottish Premiership table and have already suffered four defeats to Hearts, Kilmarnock, RB Leipzig and AEK Athens, with many like Rogic yet to contribute their best.
Brendan Rodgers' side are next in action against Hibernian at Parkhead, in what will be a tough game against Neil Lennon's second-placed side who beat Hamilton 6-0 last time out.
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