Alan Hutton claims Celtic have “taken advantage” of Motherwell after they signed David Turnbull for a lower fee than the one agreed on last summer.

Speaking exclusively to Football Insider assistant editor Russell Edge, the former Rangers and Scotland defender believes the Hoops used the attacking midfielder’s injury problems to their advantage in negotiating the terms of a move.

The Hoops confirmed on Thursday afternoon that the 21-year-old had put pen to paper on a four-year deal to finally complete a switch to Parkhead.

As revealed by Football Insider, the Hoops have agreed to pay Motherwell a marginally lower fee than they were going to last summer when his move fell through.

The Bhoys were set to pay an initial £3million plus £500,000 in add-ons before a knee problem scuppered the move and forced Turnbull to have surgery.

However, Celtic are now set to spend £2.75million with two additional add-on payments each worth £250,000.

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Hutton believes the Hoops will know full well the playmaker is fit and firing but that they have managed to use his injury setback to their advantage financially.

Hutton told Football Insider: “I think Celtic have kind of taken advantage, I think they’ve watched him enough times to know that he’s fit, by all accounts he played really well in his last game.

“They’re probably covering all bases and thinking: ‘Right, he’s had an injury, we’ve watched him, he’s doing well, let’s bring him in and see if we can get the fee a little lower.’ That’s just how clubs work.”

Turnbull managed to play just twice last season but has already featured five times for Motherwell at the start of the new campaign.

He has a total of 39 Premiership appearances, 16 goals and six assists to his name.

In other Celtic news, a senior Hoops star has been told to “knuckle down” after his teammate dealt him a bitter blow.