Alan Thompson aims to bring a winning mentality to Celtic now manager Neil Lennon has made him first team coach.
The 36-year-old recently left his post at Newcastle, where he had been in charge of the reserve side.
"We're people who were used to winning games and trophies during our careers, so that's what we've got to try and instil in the squad," said Thompson.
"I'm over the moon to be back, I thoroughly enjoyed my six and a half years here."
Thompson won four Scottish Premier League titles as a player with Celtic between 2000-07.
The former midfielder, who also had spells with Bolton Wanderers, Aston Villa and Leeds United, was capped once for England and featured in Celtic's run to the Uefa Cup final against Porto in 2003.
The appointment of Lennon, Thompson - and potentially Johan Mjallby, who acted as assistant during Lennon's interim period in charge - could be viewed as a risky strategy on the part of Celtic's board, with all three almost completely inexperienced at the top level of football management.
However, Thompson believes their combined credentials as former players at the highest level with the club should stand them in good stead as coaches.
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