The 2025/26 Champions League knockout stage is heating up. Check out the three underdogs: Bayer Leverkusen, Galatasaray, and Union Saint-Gilloise. They could shock the big teams and go deep in the competition.
Champions League Knockout Preview 2026: 3 Underdogs Ready to Cause Major Upsets
The Champions League knockout rounds are almost here. Honestly, this is the part of the season where anything can happen. If your eyes are glued to the live score for soccer, you know the tension is already building. The league phase wrapped up with some real surprises. Arsenal and Bayern Munich are locked in top spots for the round of 16 bye. Meanwhile, teams like Real Madrid, Liverpool, and Tottenham are still fighting for direct entry or trying to avoid the playoff grind. But the real excitement starts when the underdogs get their shot.
Big clubs like PSG, Manchester City, and Barcelona always grab the headlines. Look a bit closer, though, and you’ll spot teams that aren’t supposed to go far. They are consistently defying the odds against much larger opponents. These sides have scraped results, stayed super compact, and now sit in positions where one good draw or a couple of strong performances could carry them straight through to the quarters or even further.
Here are three teams that could genuinely mess up the script in this knockout phase.
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1. Bayer Leverkusen. The Quiet Machine That Keeps Rolling
Leverkusen aren’t new to upsetting expectations. Remember last season when they went unbeaten in the Bundesliga? They still carry that same mentality into Europe. Right now, they’re hovering around the playoff spots, most likely unseeded. Their style is perfect for knockout football.
They press high, transition fast, and have players like Florian Wirtz who can unlock any defence when he’s on form. Xabi Alonso keeps them organised without making them boring. In two-legged ties, that kind of discipline is pure gold. They don’t need to dominate possession. They just need to punish mistakes.
Their recent form has been solid with draws and wins against tough opponents. If they land a big name in the playoffs and manage to nick a result away from home, things could get interesting. They could easily reach the round of 16 and keep pushing. I’m not saying they’ll win the trophy, but knocking out a giant? That’s definitely on the table.
2. Galatasaray. Turkish Fire in the Snow
Galatasaray have been one of the best stories of the league phase. They’re scrappy and incredibly loud at home, and they always seem to find an extra gear when the stakes rise. They’re sitting comfortably in the mix for the knockout playoffs, and they love playing the underdog role.
Okan Buruk has built a team that fights for every single ball. Players like Mauro Icardi can win games on their own, and the atmosphere at Rams Park turns matches into something special. In Europe, that home advantage becomes massive for the second legs.
They’ve already taken points off teams they weren’t supposed to beat. If they get a kind playoff draw, maybe against a side that’s struggling at home in their domestic league, they could pull off something big. Turkish clubs have a habit of going on European runs once the momentum starts. Galatasaray feels like they’re right on the edge of one.
Sure, the passion sometimes leads to cards or a bit of drama. But it also fuels proper comebacks. Don’t count them out.
3. Union Saint-Gilloise. The Belgian Underdogs Who Love the Role
Union SG might be the most classic underdog story in this group. They’re not a household name outside Belgium, but they’ve been really solid in the league phase and earned a lot of respect. Even Vincent Kompany warned Bayern about them before their recent match. He said they fully embrace the underdog tag and use it to their advantage.
They sit deep, stay very compact, and hit teams on the break. It’s a simple plan, but it works. In knockout games where things often get tight and cagey, that approach causes real problems for possession-based sides. They’ve got talented players who work incredibly hard, and there’s no ego getting in the way.
If they manage to sneak through the playoffs, a tie against one of the top seeds could suit them perfectly. Picture a low-scoring first leg followed by a hero moment at home in the return fixture. Belgian clubs have caused surprises before. Think Club Brugge or Gent in past seasons. Union SG has exactly that same energy.
They probably won’t lift the trophy, but reaching the quarter-finals would be huge, and it would send proper shockwaves.
Why These Teams Could Actually Go Far. Quick Reasons
Here’s why these three have a real chance to cause chaos:
- Knockout football flips everything. No more eight-game buffer. It’s win or go home every time.
- Underdogs often handle pressure better than favourites. One red card, one dodgy penalty, or one moment of magic can change the whole tie.
- Leverkusen bring tactical discipline that shines in two-legged games.
- Galatasaray have raw intensity and a home crowd that can swing matches.
- Union SG play with heart and zero fear, which is dangerous against complacent big teams.
- The February playoff round sets the tone. Survive that tie, and the confidence goes through the roof.
Of course, the big boys still look strong. Arsenal are sitting pretty at the top, Bayern keep rolling, and Real Madrid are always dangerous. For fans catching the matches live on mobile, watching these giants perform is a weekly spectacle. But that’s exactly what makes the Champions League so good. Every single tie carries that “what if” feeling.
Keep an eye on these underdogs when the draws come out. One or two of them could deliver real chaos and give us stories we’ll still be talking about years from now.
The knockout phase starts soon. Playoffs hit in mid-February, and the round of 16 follows in March.