Ange Postecoglou's Celtic side went into Sunday's fixture against Dundee knowing that a win would see them extend their lead at the top of the Premiership table, as their Glasgow rivals had dropped two points away at Dundee United earlier in the day.

And, despite falling behind to the team sitting bottom of the top-flight in the first half of the fixture, as well as the Dark Blues drawing level in the second half after Giorgos Giakoumakis had given the hosts the lead with a quickfire double shortly before the break, the Greek international's completion of his hattrick in the 86th minute ultimately proved enough for Celtic to get over the line - with the game finishing 3-2 in the Hoops' favour.

However, as is perhaps to be expected after such a close run encounter against an outfit who have picked up just 21 points so far this season, a number of the Bhoys players were far from their best on Saturday, with Daizen Maeda - despite a tireless performance on the left-wing - proving wasteful in front of goal, while centre-back duo Carl Starfelt and Cameron Carter-Vickers were also rather sloppy at the back.

Although, it will undoubtedly be central midfielder Matt O'Riley most disappointed with his performance in the 3-2 victory, as the 21-year-old's display was by far his worst since his £1.5m move to Parkhead in January.

Lost possession 20x

Despite having averaged a quite astonishing SofaScore match rating of 7.76 over his five previous Premiership outings - scoring one goal, registering one assist and creating three big chances for his teammates in these fixtures - the former England U18 international was well below-par over his 79 minutes on the pitch on Sunday.

Indeed, while the £405k-rated midfielder did complete 42 passes - one of which was key - against the Dark Blues, he was also uncharacteristically sloppy with the ball at his feet, failing to find his intended target with any of his six attempted crosses, his one attempted long ball and ceding possession for his side on a whopping 20 separate occasions.

The youngster also lost four of his seven duels, gave away one foul, failed with his one attempted dribble and was dribbled past by an opponent once.

These returns saw the 21-year-old who Bhoys Analytics dubbed an "all-rounder" earn an extremely disappointing SofaScore match rating of 6.5, while the Scottish Daily Express awarded the midfielder a six in their own player ratings, as well as stating of his display:

"This was probably the January signing's least effective game since joining from MK Dons as he struggled to have a big influence on the match."

As such, with the mammoth task of overturning a 3-1 first-leg defeat away at Bodo/Glimt in Thursday's Europa Conference League play-off fixture, O'Riley's performance against Dundee will have undoubtedly given Postecoglou something of a selection headache ahead of the European clash - as a repeat of his display against the Dark Blues could well cost his side a shot at overturning their two-goal deficit against the Norwegians.

In other news: Ange may have made a grave mistake on "immense" 21 y/o, it could cost Celtic big time