A former Celtic coach is accused of sexually assaulting a woman while her boyfriend was having a shower.

Derek Livingston, 25, allegedly attacked the 21-year-old on May 25, last year.

She claimed that Livingston pulled down the body suit she was wearing and touched her breasts.

The woman, who cannot be named for legal reasons, said: “He exposed both my breasts and my entire breast was on show.

“He took his hand and his finger and played with my left nipple.

“I don’t remember what hand he used but his finger was on my nipple - he rolled it around."

Earlier with another friend they had watched Celtic’s Scottish Cup final win in the Walkabout bar in Glasgow.

The trio then went to a flat in Glasgow's West End where Livingston is accused of sexually abusing the woman.

READ MORE: Glasgow parents warned as primary schoolkids circulating vile sex video

He later texted her boyfriend denying the assault, claiming that he was trying to “wake her up.”

Livingston is on trial at Glasgow Sheriff Court charged with a sex assault on the woman.

The court heard that they were picked up at 7pm from the pub by the woman’s boyfriend and went to his house.

The woman told prosecutor Amy Hunter that her boyfriend went in for a shower, and Livingston allegedly pounced.

She said: “I froze, I closed my eyes and pretended to be sleeping.

“This lasted around 30 seconds or so and it stopped because I moved my body.

“There was a second incident where he lifted my top and did the same as before and this took no longer than one minute.

“The bathroom door opened and then he stopped.”

The woman told the court that she didn’t tell her boyfriend until later that night.

He sent a text message to the woman saying: “I shook you to wake you up and your nipple was exposed and I touched it.”

Livingston, from Glasgow’s Pollok area, denies the charges and the trial continues before Sheriff Ian Miller.

Celtic say Livingston hasn't been associated with the club for seven months.