CELTIC last night agreed to take £12 million Manchester City winger Patrick Roberts on loan for the next 18 months.

Roberts, who has played three first team games for City this season, will travel to Glasgow this weekend to undergo a medical and finalise the deal.

The 18-year-old, who the Etihad Stadium club signed from Fulham last year, is considered one of the most exciting prospects in English football and securing his services is something of a coup for the Scottish champions.

Deila revealed on Thursday the arrangement hinged on City allowing Celtic to have the England Under-19 internationalist for longer than the remainder of the 2015/16 campaign.

Deila has a good relationship with coaching staff at City having taken their players on loan in the past with both his former club Stromsgodset and with Celtic.

Roberts is expected to be in the stands at the League Cup semi-final between Celtic and Ross County at Hampden tomorrow.

Meanwhile, Deila last night denied that Celtic should expect to win the treble just because Rangers are currently unable to challenge their dominance of Scottish football.

Deila’s side can take a huge step towards a clean sweep of domestic trophies if they can beat County.

They will follow up that game with a huge Premiership match against second-placed Aberdeen on Wednesday night and a Scottish Cup fifth-round game with East Kilbride on Sunday.

The Parkhead club just missed out on completing the treble last season when a controversial refereeing decision denied them victory over Inverness Caledonian Thistle in the Scottish Cup semi-final.

Hopes are high among the Scottish champions’ supporters that they can go one better in the 2015/16 campaign and win the League Cup, the Premiership and the Scottish Cup.

However, Celtic have only won the treble on three occasions in their 128 year history – in 1967 and 1969 when Jock Stein was manager and in 2001 when Martin O’Neill was in charge.

Deila dismissed suggestions Rangers’ absence from the Premiership makes achieving the feat easier and paid tribute to the difficulties which Aberdeen, Hearts and others present his side.

“Not so many have done it, but all the managers have tried,” he said “You can see how hard it is. How can I judge myself from what was before? I can only deal with what is now. We always have respect for the other teams. The teams are developing – Aberdeen are taking more points, Hearts are getting better and more consistent and they are a tougher team to meet.

“It is important to give others credit as well and not say that everything is so bad. Why do we play football here if everything is so easy? You could just give us the three trophies at once?

“Maybe it was harder before, but it hasn’t been done since Rangers left so it can’t be so easy. Neil Lennon is a good manager but, like you saw last year, it is small details. We won a lot of games, we won the league, we won the League Cup but it is not done easily.

“I think everyone knows what we are playing for. It is difficult here because you have big games all the time so trying to get some learning in is a challenge and you have to take it calmly. But we have a lot of experience of games like this and that is an advantage for us.”

Meanwhile Deila has confirmed that neither Liam Henderson or Anthony Stokes, who Celtic have loaned to Hibs, will be able to play in the League Cup final in Hibs beat St. Johnstone today and Celtic defeat Ross County tomorrow.

Henderson, who has become an important player for Alan Stubbs’ side since moving to the Easter Road club at the start of the season, had expressed hope he could be involved if the two clubs make it through the semi-finals.

But Deila said: “I don’t think they (Henderson and Stokes) would play. I thought that was a rule here. I have just seen it when we have met other teams with players on loan and they don’t play.”

Meanwhile, Deila has revealed that Scott Brown, the Celtic central midfielder and captain, has resumed full training at Lennoxtown two months after suffering knee ligament damage in a Premiership game against Kilmarnock at Parkhead.

The Norwegian admitted the Scotland internationalist has a chance of starting against County. But it is unlikely he will be risked from kick-off due to the length of time he has spent out of the game.

“He (Brown) is close to playing but we will see,” said Deila. “He is in full training which is positive, but he has been out for a while.”