Dundee United have launched an internal investigation into the alleged role of two of their players in an incident that left the club's former goalkeeper, Lukasz Zaluska, with facial injuries.
Zaluska, who now plays for Celtic, was left with two black eyes following the incident in Glasgow's west end in the early hours of Monday morning.
Police investigating the case had refused to confirm rumours that another Premiership player was involved in the flashpoint, but after Dundee United's Mark Wilson released a statement today saying that he tried to "calm" the situation down, the Tannadice outfit confirmed they would initiate their own probe.
"The Club will make no further comment at this stage."
Deila, who recently called for his players to be "24-hour athletes", absolved the Pole of any blame after he was attacked in the same area of Glasgow where then Celtic coach Neil Lennon was knocked unconscious in an attack in 2008.
Deila, speaking ahead of Celtic's Europa League clash with Romanian side Astra tomorrow night, insisted Zaluska had not broken any club rules.
Deila said: "I have talked with Lukasz and I'm sorry for him because it could be quite scary. But in my opinion he has done nothing wrong.
"This is a police matter now and we just have to see what's happening.
"But he is fine now and he is ready for the game tomorrow, that's the most important thing. He has trained the last two days so that's very good. He was in the hospital and everything was fine."
Deila did not want to offer an opinion on who else might have been involved in the flashpoint.
"It's hard to say," he said. "I don't know what's behind it and I don't want to have any opinion about it either before I know what's happened. Now the police are on the scene and we will take it from there."
Zaluska earlier said he was unaware of who hit him.
The 32-year-old former Dundee United player said: "I had no idea who did it because I couldn't see their face. It was all over so quickly.
"I heard someone shouting something and then I was attacked from behind. I was punched on the head from behind and then hit the floor. I didn't see their faces."
Deila did not see the need to speak to any other player about their personal safety on nights out.
"I haven't talked with them but they are grown up and know how to behave and what's expected," the Norwegian said.
"You never know, people have been in different situations and just have to learn from things."
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