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RONNY DEILA has revealed Celtic have a fee agreed with Manchester City to land John Guidetti in January – if they can persuade him to sign.

And the Norwegian hopes Scott Brown’s decision to pen a long-term deal will persuade the striker to stay for glory rather than leave for cash.

On-loan Guidetti’s form has alerted a host of clubs in England and Europe to his availability as a free agent next summer when his City

contract expires.

The Hoops are keen to avoid a wages auction for his services – and the manager insists their best chance of landing him will be to exercise their “option to buy” when the window opens.

He said: “With every player we bring in on loan we try to have an option to buy.

“That’s why we know what it will cost. It could be harder at the end of the season. This decision has to be taken before that.

“He should stay here. He will develop and achieve big things. This is the right club for him, especially at the age he is now.”

Asked if they had the same arrangement in place with fellow City loan star Jason Denayer, though, Deila said: “No.”

The Celts boss believes skipper Brown’s commitment until 2018, shunning the idea he needed to go to England to prove himself, should show Guidetti the way.

He said: “I hope other players are now thinking the same way as Scott. He’s the captain of Scotland and Celtic. He has won everything here and played in the Champions League. He doesn’t need anything more.

“You don’t have to go to other clubs to show yourself. If you stay here a long time you are doing something right.”

Joe Ledley and Gary Hooper both left Celtic behind for Crystal Palace and Norwich after failing to agree new deals.

Deila said: “I understand why – but I wouldn’t do it. If you are at Celtic, even if you could have earned double at another club, you are still going to have a nice life. Playing here is a big honour and hopefully more players like Broony will understand that. Like Guidetti? I think so. If John also signs that’s good.”

Meanwhile, Deila last night warned his sloppy stars they must raise their game on Thursday if they’re to topple Red Bull Salzburg from the top of their Europa League group.

The boss was raging at his side’s lacklustre display in yesterday’s 2-1 win at home to Dundee. Despite bagging the points thanks to goals from Anthony Stokes and Guidetti to stay top of the Premiership, Deila was angry at his players for easing off the gas.

The Celts gaffer, who expects Denayer to be fit for Thursday despite the player being sent to hospital yesterday for a scan on a leg injury, said: “That performance will not be enough against Salzburg. Not near.

“At 2-0 up we should attack and go for three and four. When teams are 2-0 down they have no energy and confidence so I can’t understand why we are dropping.

“I expected more. We were not together enough in the pressing and not compact.

“Then we conceded a stupid goal and got a little bit frightened. We have to get up to another level for Thursday.”

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