KRIS COMMONS insists that 'time is running out' for Rangers' January arrivals Amad Diallo and Aaron Ramsey to make a telling contribution towards the Premiership champions' bid for back-to-back titles.

Diallo was signed by Manchester United in a deal worth around £37million in January of last year but with the winger struggling for game time at Old Trafford, the decision was taken to ship the 19-year-old out on loan to Ibrox last month. Wales internationalist Ramsey arrived at Ibrox on deadline day on a temporary move.

Diallo has failed to entirely convince during the first month of his loan spell while Ramsey is yet to start a match for Rangers - something that concerns Commons.

Giovanni van Bronckhorst's men were held to a 1-1 draw at Tannadice on Sunday afternoon and Commons believes that the 'stuffy' contest is exactly the type of game that Ramsey should be able to turn the tide in.

And the former Celtic attacker believes there are serious question marks hanging over the heads of the January arrivals.

"Listen, no one can take anything away from Rangers for what they did against Borussia Dortmund," Commons wrote in his Daily Mail column.

"They were outstanding and fully deserved to win the match. It was the best result for any Scottish club in Europe since Lionel Messi, Xavi, Iniesta and Co were humbled at Celtic Park.

"But, domestically, I suspect their fans are now becoming concerned.

"Rangers are spilling points at an alarming rate. They went into the winter break top of the table and with a six-point lead over Celtic.

"Now they trail Ange Postecoglou's side by three points.

"That's a nine-point swing in the space of barely six weeks. Celtic have just gone through the gears, while Rangers have stumbled too often.

"It looked like they would maybe get away with it yesterday, only for Celtic to score a dramatic late winner against Dundee.

"This already feels like it has all the hallmarks of another post-winter collapse as we saw during Steven Gerrard's first two seasons in charge.

"What happened against Dortmund was great and I wish them all the best for the second leg. It would be brilliant for Scottish football if they can knock out a genuine European heavyweight.

"But their chances of retaining the league title are beginning to go down the drain. It must be a concern for Giovanni van Bronckhorst."

Commons continued: "Given the manner of the performance in Dortmund and the form of Ryan Jack, Joe Aribo and John Lundstram, I felt Aaron Ramsey might not get into Rangers' strongest team.

"Glen Kamara seems to have lost his way slightly which might have opened up a door for Ramsey, but he wasn't in the squad at all yesterday due to injury.

"Time is running out for him to make any sort of appreciable impact at Ibrox. He was signed to make the difference in the title race, to help Rangers unlock stuffy defences with his passing and vision.

"Yesterday was exactly the kind of game where they'd have hoped he could help, but he wasn't fit enough to play any part.

"As for Amad Diallo, he already looks like he's in the wrong movie. Just because Manchester United spent £37million on him, that's no guarantee of success."