Celtic's Norwegian manager Ronny Deila accused his team of lacking professionalism after two of them argued over who should take a crucial penalty in the Champions League second qualifying round tie against Stjarnan of Iceland.
The former European champions won 2-0 but Leigh Griffiths missed the late spot-kick that would have ensured a much more comfortable margin for the second leg in Reykjavik after Stefan Johansen and Griffiths argued over who should take it.
"It is Leigh Griffiths who takes the penalties, it should be very clear," Deila told reporters. "There is nothing professional about it. We shouldn't fight about who takes a penalty.
"Of course it impacts on the taker, it gives extra pressure to him. The longer you have to wait, the more chance you have to miss it.
"3-0 is a totally different result to 2-0, so it's disappointing."
Dundee United have accepted an undisclosed bid from Celtic for Nadir Ciftci.
The Parkhead club had reportedly seen two initial offers rejected over the past fortnight, but have now been successful at the third time of asking with an offer thought to be around £1.5m.
The Turkish striker will now discuss personal terms with the Scottish Premiership champions.
A statement on www.dufc.co read: "Dundee United today confirmed that an undisclosed fee had been agreed with Celtic for Nadir Ciftci and permission has been granted for the Glasgow club to speak to the player."
The 23-year-old must be registered by Saturday if he is to be available for the Hoops' Champions League qualifier against Icelandic side Stjarnan FC next Wednesday.
The Tangerines, meanwhile, are due to fly out on a pre-season trip to Holland on Thursday.
Celtic will face Stjarnan of Iceland in the Champions League second qualifying round.
Celtic have confirmed the signing of Manchester City defender Dedryck Boyata.
The Parkhead club issued a press release which revealed 24-year-old Belgium international will be presented at a media conference at Celtic Park at lunchtime.
Boyata, who flew into Glasgow on Sunday, is manager Ronny Deila's first summer signing.
The trial of Celtic striker Anthony Stokes for an alleged assault on an Elvis impersonator has been adjourned.
Lawyers for the former Sunderland forward said they were ready to proceed with the hearing into an alleged incident in Dublin on June 8 2013.
Judge Patricia Ryan, at Dublin's Circuit Criminal Court, said she would put the case back for mention before the same court on May 12.
But she said she could not guarantee that it would proceed then.It is expected the trial will take two days.
The Ireland and Celtic player was in court, dressed in a white shirt, blue tie and grey suit, for the brief hearing.
He has been remanded on bail since last year.
Stokes, 26, was arrested by appointment and charged with assault causing harm to Anthony Bradley, 42, at Buck Whaley's nightclub on Leeson Street, Dublin.
John Guidetti has been found guilty and censured for singing an ''offensive'' song about the demise of traditional rivals RangersRead the full story ›
Celtic have been fined just under £10,000 by Uefa following the misbehaviour of both their players and fans during last month's Europa League clash with Inter Milan.
The Hoops have been ordered to pay 8,000 euros (£5,861) after collecting five or more cautions during the 1-0 defeat to the Italians at San Siro.
They were also hit with a further 5,000-euro (£3,663) punishment after travelling supporters set off flares during the Round of 32 fixture, which saw the Scottish champions crash out after a 4-3 aggregate defeat.
Ronny Deila captured his first trophy as Celtic manager as the Hoops beat 10-man Dundee United 2-0 in the Scottish League Cup final at Hampden Park
The Norwegian boss targeted the domestic treble when he took over from Neil Lennon last summer and part one was completed with goals from Kris Commons and substitute James Forrest.
Celtic's Virgil van Dijk should be targeting a move to one of England's top six clubs if he quits Parkhead this summer, according to former Hoops striker John Hartson.
The £12million-rated Dutch defender has been linked with Barclays Premiership high-flyers Arsenal and Southampton following another season of classy displays.
I like big Virgil. I think he's the full package. He's quick, he can leap and defensively he is sound.
Celtic did fantastically to keep hold of him in the summer. It was a fantastic bit of business by Ronny Deila, who no doubt has had a word in his ear and told him: 'If you give me another year to 18 months, then you can have your move'.
He will keep improving with Celtic and in time, he will become a top-class centre-half that a lot of clubs will be interested in.
We've seen a lot of players leave Celtic but end up with clubs at the bottom end of the Premiership.
Now the question is, would a club like Manchester City trust him to be playing in big games domestically and in the Champions League every week? Or is he someone who is more suited to being at a club like Swansea, Newcastle or West Ham, where you are playing in that middle half of the table?
Is he top notch? Is he as good as the Laurent Koscielny's of this world?
I think he is. I think he is a top-six Premier League player. I really do.
Celtic boss Ronny Deila has offered up a stout defence of the Scottish game by claiming its English counterpart often bores him in comparison.
Speaking at Celtic's Lennoxtown training complex ahead of the trip to St Johnstone on Saturday, Deila noted the increase of money into the game south of the border.
However, the former Stromsgodset boss stated enthusiastically that he has been impressed with that he has witnessed so far in Scottish football, including the atmosphere in the Hoops' Scottish League Cup semi-final win over rivals Rangers at Hampden earlier in the month.
I think we should be more proud of it (the game in Scotland). The interest here is phenomenal. It is something special. When you go to Celtic games away, the fans are fantastic.
I have been many times to England and I am bored compared with what's happening here in the stands sometimes.
The game against Rangers is special. They don't have that. I have been at United, Arsenal, Liverpool, Tottenham and it's not near the atmosphere there was in that game.