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For the first time, 4 Belgian clubs entered the 1968–69 Inter-Cities Fairs Cup: KSV Waregem beat Atlético Madrid of Spain on away goals (lost 1-2 away, won 1-0 at home), Standard Club Liégeois was defeated by Leeds United (drew 0-0 at home,lost 2-3 away), K Beerschot VAV by Door Wilskracht Sterk of the Netherlands (drew 1-1 at home, lost 1-2 away) and R Daring Club Molenbeek by Panathinaikos FC of Greece (won 2-1 at home, lost 0-2 away).
As well as Anderlecht, Croon coached in the Netherlands and Belgium with DWS, VER, HVC, FC Volendam, K.S.V. Waregem, Lierse S.K. and NEC.
Back in the Netherlands, he tried to sign with local Amsterdam side AFC DWS, but the club was unable to come to terms with his former club the Chicago Mustangs, where he was still under contract.