Celtic manager Ronny Deila has expressed sympathy for assault victim Lukasz Zaluska following his goalkeeper's "scary" experience.

Zaluska was left with two black eyes following an incident in Glasgow's west end in the early hours of Monday morning.

Deila, who recently called for his players to be "24-hour athletes", has absolved the Pole of any blame after he was attacked in Ashton Lane, the same place 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 on Thursday night, insisted the former Dundee United player 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."

Police are investigating the incident, but have refused to comment on reports that another Scottish Premiership player was involved in the attack.

And Deila did not want to offer an opinion on that potential scenario.

"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."