The Hoops have suffered damaging results in recent weeks.
“That is nonsense,” said the Norwegian, in quotes published by the Daily Record.
“If you go to a dressing room in one of the 20 biggest clubs in Europe, you will find more nationalities than you find players.
“Here, half of our group is Scottish or British. There is a very good atmosphere, they are having fun together."
The last few weeks have been tough for Deila’s side, with the failure to qualify for the Champions League for a second successive season followed up by defeat to nearest title challengers Aberdeen last weekend.
Rumours of bust-ups and disharmony among the Celtic squad had begun to circulate, but Deila was quick to insist that the only discussions have been down to the players’ collective will to win and determination to put things right.
“… But everybody hates losing and, if you don’t have any conflicts or disagreements, then you have no culture in the dressing room,” said the Celtic boss.
“I would be much more worried if there was no conflicts in the group, because then you don’t care when you lose.
“You have to hate losing. Look at Scott Brown. I can assure you that if the fans are having a bad time when we are losing, he is ten times worse.
“Everyone in this group are winners, they all hate losing. We are used to winning and we are going to get back on track, that’s how it is,” he added.
Celtic have a chance to put things right quickly in tonight’s Europa League glamour tie at the Amsterdam Arena, and Deila will be hoping for an immediate response.
The Eredivisie runners-up are a talented bunch but their attacking, expansive style could fall into the Hoops’ hands.
Pace on the counter-attack is arguably the strongest trait of this Celtic side under Deila, and with the likes of James Forrest, Leigh Griffiths and Stuart Armstrong primed to exploit any gaps, Ajax will need to take care in their approach play.