The Frenchman started his reign at Parkhead just a few days after being appointed with a 2-1 home loss to Hearts on Sunday which saw the Hoops fall three points adrift of the William Hill Premiership leaders with a game in hand.

Much was made of Nancy using a hand-held tactics board at the side of the pitch during the game to inform players of changes, while one radio pundit even questioned his choice of green trainers.

Speaking at Celtic Park ahead of the Europa League game at home to Roma on Thursday night, the 48-year-old former Columbus Crew and Montreal boss said: "People deserve the right to talk.

"I'm going to dress one way, maybe they are going to say that they don't like the way I dress, so I don't waste time on that.

"If I use it (the tactics board), it's because it's good fo

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