Things very much look as if they are on the up for Celtic at present, with the Bhoys remaining undefeated over their last nine fixtures in all competitions, qualifying for the final of the Scottish League Cup and closing the gap on the current Scottish Premiership leaders to just four points.

However, despite the positives, there is still undoubtedly a great deal of work that Ange Postecoglou needs to do in the upcoming January transfer window if he is to keep Celtic firing on as many fronts as possible this season.

And, while Joe Hart has become the Hoops' undisputed number one since joining from Tottenham Hotspur this summer, there is undeniably a significant lack of quality in depth behind the 34-year-old shot-stopper, with the prospect of the former England international picking up an injury being dubbed a "nightmare" scenario by Chris Sutton.

However, before splashing the cash on a new signing between the sticks in January, perhaps it would be wise for Postecoglou to take a closer look at one of Celtic's up and coming youth products in the position - in the shape of 18-year-old Tobi Oluwayemi.

Oluwayemi can save Celtic millions

Having been selected ahead of Vasilis Barkas as part of Postecoglou's matchday squad for the Bhoys' 3-2 Europa League win over Ferencvarosi TC at the start of the month, it is evident that there are high expectations for Oluwayemi at Parkhead.

Indeed, the teenager has been impressing for Celtic's B team in the Lowland League this season, with the reserve side's coach, Darren O'Dea, stating upon the 18-year-old's call up to the England U19 international squad: "We're going to miss him for a couple of games but that's a success. We thought he would be involved with the U19s team and then the added surprise of being involved with the first team is fantastic. It's why we're here, it's why he's here."

Furthermore, Postecoglou is also known to be a personal fan of the former Spurs youngster, something which is largely down to the goalkeeper's excellent ability with the ball at his feet - a crucial and perfect trait for a shot-stopper to possess in order for the 56-year-old manager to implement his particular brand of football efficiently.

And, with reports suggesting that Barkas could be on his way out of Parkhead in January, there would very much appear to be a space that requires filling in Celtic's first-team squad for the second half of the campaign, a slot which Postecoglou could save Celtic millions of pounds in transfer fees on if he decides to place his trust in the teenager O'Dea dubbed a "really good" talent.

In other news: Huge blow: Celtic dealt injury setback ahead of Bayer clash, fans will be fuming