Adam Montgomery has suffered a nightmare hamstring injury just days after signing on loan for Motherwell.

The Celtic youngster spent the first half of the season with Fleetwood in England's League One, but he was recalled this January and subsequently loaned out to the Steelmen.

Montgomery started and assisted a goal as Motherwell defeated Alloa in the Scottish Cup, but The Sun now report that he is set to be out for three months after picking up a hamstring strain in training.

The Celtic defender is now set for scans to detail the severity of the strain, but Well boss Stuart Kettlewell could now be forced to bring in further defensive recruits in the final week of the January transfer window.

Meanwhile, Brendan Rodgers vowed Celtic would not be selling any key players this month after rejecting Atletico Madrid’s bid for Matt O’Riley.

Rodgers described the LaLiga side’s offer for the Denmark midfielder as way below Celtic’s valuation but claimed the money was irrelevant with the club not needing to sell.

Celtic’s lead at the top of the cinch Premiership was cut to five points by Rangers’ win over Hibernian on Wednesday with the Ibrox club still holding one game in hand.

And Rodgers is keen to emerge from the window with a stronger squad rather than a weakened one.

“Matt is a player we don’t want to lose and he won’t be going anywhere in January,” Rodgers said.

“It’s a great testament to him and what the club can do for a player. He won his first international cap this season and Atletico Madrid are a big club in European football.

“But he is very much part of what we are doing. He has been a joy to work with and I had a good chat with Matt and he is someone who will be here for us in the second part of the season.”