Celtic defender Charlie Mulgrew insists the club's poor run of form is not down to a lack of mental strength.
Neil Lennon's side have slipped 10 points behind league Scottish Premier League leaders Rangers and dropped to third in the table.
But Mulgrew said: "I wouldn't question anyone at this club's mental strength. There's a very strong mentality here.
"I don't think that's an issue, it's just a matter of putting a run together."
Defeat by Hearts before the international break led to Lennon's side falling further behind city rivals Rangers in the title race.
And Mulgrew believes Celtic must embark on a winning run - starting against Kilmarnock on Saturday - to reignite their challange.
"It's only October and there's a long, long way to go," he said.
"We're looking to win every game, like we always do, and be as positive as we can.
"There'll be a lot of twists and turns between now and the end of the season and we'll look to win every game and be as positive as we can."
Following Scotland's disappointing failure to qualify for the Euro 2012 finals, Mulgrew said he was keen to play his part for the national side.
"I've had no contact from Craig Levein, but I'll just keep doing what I'm doing and hopefully the chance will come," he added.
"I'm sure the manager will do what he thinks is best for the country: we'll see."