Adam Matthews admits Scott Brown's decision to stay at Celtic has given the rest of the squad a new determination.
The 26-year-old midfielder has agreed a new deal until 2015, ending speculation about a move elsewhere.
The Hoops are in seemingly unstoppable form in the Scottish Premier League, having won their last five games, closing the gap on leaders Rangers.
Matthews told the Evening Times that Brown staying at Celtic Park has inspired him and his team-mates.
He said: "It's given us all a massive boost. He really is Mr Celtic, he lives and breathes it.
"When he's playing, everyone just seems to add an extra 10 per cent, so it's a huge plus that he's signed a new contract."
Neil Lennon's side beat Dundee United 1-0 on Sunday and are only four points behind Rangers at the top of the table.
Celtic have three more games to play before they meet their Old Firm rivals on December 28, but Matthews is impressed with their current form.
He said: "We've got to know each other better, we've been playing with each other for longer now and we've started to understand each other's games.
"We're full of confidence and it was nice to get a clean sheet.
"Our performance, especially in the first half, was very good against United."