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A clause giving the selling club a percentage of any future transfer fee. If you sell a player for £10m with a 20% sell-on, and they're later sold for £50m, you get £8m (20% of the £40m profit). Smart for clubs who develop young players - you benefit from their continued success even after they leave. Can complicate future deals though.
Southampton's sell-on clauses on former players like Gareth Bale, Luke Shaw, and Sadio Mané generated millions in additional revenue when those players moved for bigger fees - a key part of their business model.
Robbie
Jan 17, 2026
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