Ferdinand and Hargreaves were both part of Manchester United's Champions League-winning squad in 2008, when we famously defeated Chelsea on penalties in Moscow to claim the European trophy for a third time.
United's former no.5 also represented Leeds United in Europe, reaching the semi-finals in 2001 - the same year our former midfielder won his first Champions League trophy with German giants Bayern Munich.
Both players shared the same opinion when questioned on which European venue away from Old Trafford has the greatest atmosphere.
"I always thought Celtic Park was crazy", said Owen sat alongside Rio during an interview with MUTV's Mark Sullivan.