Subject: Royal Union Saint-Gilloise (Belgian Pro League)
Period: 2021–2024
Objective: Defensive Marginal Gains & Goalkeeper Performance Optimization

THE CHALLENGE: COMPETING ABOVE THEIR BUDGET

Following promotion back to the Belgian Pro League in 2021, Royal Union Saint-Gilloise knew survival alone wouldn’t be enough. Thier Sporting Director approached INCISIV looking for innovative ways to generate marginal gains that could help RUSG compete with clubs operating with significantly greater financial resources.

INCISIV’s analysis identified a key performance gap:

A 6.7% difference in Save Percentage between Union SG and league leaders Anderlecht from the previous season.

When factoring in league prize money, wages, bonuses, and European qualification revenue, that gap became financially significant:

£200,381 per league point in the Belgian Pro League.

For Union, improving goalkeeping performance by even a small percentage could have a major impact on league position, qualification opportunities, and long-term club growth.

THE DIAGNOSIS: SMALL DETAILS, BIG OUTCOMES

Union’s coaching staff identified that elite goalkeeping isn’t only about making spectacular saves—it’s about positioning, movement efficiency, and staying sharp in low-action matches.

Traditional goalkeeper training creates repetition, but often lacks:

• consistent technical feedback
• high-volume scenario repetition
• match-realistic cognitive loading
• opportunities to rehearse without physical fatigue

Goalkeeper coach Laurent Deraedt quickly recognized CleanSheet Pro’s advantage:

“This allows us to work on the smallest details—shoulder position, arm shape, leg placement—and repeat those movements until they become instinctive in matches.”

For a club searching for every edge, those details mattered.

THE INTERVENTION: EMBEDDING VR INTO THE PERFORMANCE MODEL

Beginning in September 2021, Union integrated CleanSheet Pro into their weekly goalkeeper programme.

Using VR, Union’s goalkeepers were able to train:

• close-range reactions
• cut-back scenarios
• crossing decisions
• foot positioning and set shape
• body mechanics through instant replay analysis
• high-volume repetitions without physical load

What initially felt unfamiliar quickly became a trusted part of the process, with goalkeepers embracing the realism, repetition, and immediate technical feedback VR provided.

Most importantly:

They could stay sharp, even when match volume was low.

THE RESULTS: THREE YEARS OF DEFENSIVE EXCELLENCE

The impact was immediate.

2021/22
• Anthony Moris recorded 15 clean sheets — most in Belgium
• Union led the regular season standings
• Finished 2nd overall
• Qualified for Champions League football, ending a 58-year wait for European competition

2022/23
• Finished 2nd again in the Pro League
• Moris made the fewest saves of any goalkeeper in the division, highlighting elite defensive structure and consistent sharpness
• Reached the UEFA Europa League Quarter-Finals

2023/24
• Competed across domestic and European competitions
• Maintained strong defensive discipline
• Established themselves as one of Belgium’s smartest-performing clubs defensively

CONCLUSION

This case study highlights how CleanSheet Pro helped Royal Union Saint-Gilloise turn marginal gains into meaningful competitive advantage.

By improving technical precision, cognitive sharpness, and goalkeeper readiness without increasing physical load, Union built a defensive platform capable of sustaining elite performance over multiple seasons.

At the highest level, small gains create big outcomes.

For Union Saint-Gilloise, CleanSheet Pro helped make those gains repeatable.

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