Celtic's Europa League campaign seemed to be spiraling downward. With an hour gone at Parkhead on Thursday, the Hoops trailed Besiktas 1-0 and were staring at a fourth consecutive defeat in the competition. The atmosphere was tense, and hope was dwindling. But then manager Martin O'Neill made a decisive move, bringing on Callum Osmand and Camilo Duran for Sebastian Tounekti and James Forrest. The impact was immediate and transformative.

Instant Impact

Within 43 seconds of his introduction, Osmand found the net, guiding a first-time shot into the bottom corner past Alexander Nubel. The 20-year-old's strike not only leveled the score but also injected belief into a Celtic side that had been lacking a cutting edge. Besiktas, previously comfortable, suddenly looked rattled. Osmand's pace and directness gave Celtic a threat in behind, stretching the Turkish defense.

As the game wore on, O'Neill made another bold call, withdrawing club-record signing Kasper Hogh on 77 minutes and shifting Duran into a central role. The Colombian, who had been operating wide, immediately made an impact. Osmand turned provider, threading a delightful pass through for Duran, who calmly rounded Nubel and slotted home to give Celtic the lead. The home support erupted, but there was more to come.

Orkun Kokcu equalized for Besiktas with a fine strike, setting up a tense finale. However, Duran had the last word. Two minutes later, he controlled Kieran Tierney's scuffed shot and beat Nubel from close range, sending Parkhead into raptures and securing Celtic's first Europa League win of the season.

Tactical Masterstroke or Lucky Break?

Former Celtic midfielder Stiliyan Petrov praised the substitutions, telling TNT Sports: "Everything changed with the subs; Osmand coming on and Duran going through the middle. They freed up space for Nygren and Baur. It was a really positive 30 minutes." The impact was historic: not since Johannes Edvaldsson in 1977 had a Celtic substitute scored twice in a European match (excluding qualifiers).

O'Neill, however, downplayed the idea that his substitutions were a stroke of luck. "It was in design to do exactly what it did," he insisted. "We've played nine games in 25 days, some players needed a breather and you can get re-energised from coming on the field. I'm going to say that that was our plan and those players were going to come on the pitch at some point in the game."

Yet the contrast between Celtic's attacking play with Hogh and with Duran was stark. Hogh, signed for £11m from Bodo/Glimt in the summer, has now failed to score in 16 of his 17 appearances for the club. Against Besiktas, he had no shots and just one touch in the opposition box during his 77 minutes on the pitch. Duran, in just 30 minutes, scored twice, had two shots, and registered four touches in the Besiktas area.

What Now for Hogh?

O'Neill has previously admitted uncertainty over his best XI, but the evidence is mounting that Duran is the superior option through the middle. Despite Hogh's hefty price tag, it seems inevitable that he will be benched for high-stakes games. "It'll be tough for Hogh," said Hearts defender Craig Halkett on TNT Sports. "He was the big-money signing but it's not coming off for him. As a player you need to keep your head down, keep working hard and hope it turns."

Osmand, too, has staked a claim for a starting spot on the left. The former Fulham man is direct, possesses an eye for goal, and has a knack for scoring in big games. "This is a great team we're playing against," Osmand told TNT Sports. "Camilo did amazing, he's such a poacher. Credit to him. It's a lot harder starting games. The team dug in, stayed strong and we got our rewards. The goal caught me off guard, but I'm just glad I caught it nice. I just want to come on and make something happen. So happy with tonight."

As Celtic bask in the glow of a memorable comeback, O'Neill faces a selection dilemma. Duran's heroics have surely earned him a starting role, while Hogh's struggles continue. The manager must now decide whether to persist with his record signing or fully embrace the Duran-Osmand axis that turned the game on its head. One thing is certain: Celtic's season has been reignited, and the competition for places is fiercer than ever.