General Catalyst has led an £85m funding round for UK-headquartered online bank Monzo alongside Accel Partners.
Danish internet company could reportedly be listed at a valuation of $1bn
Deal sees Carrefour retain a minority stake, alongside the company's founders, Frédéric Mazurier and Isabelle Clairac
Transaction could reportedly value the company at more than €2bn
Company says Gardaworld's offer is "nowhere near a full and fair price"