Witsel returned to his native Belgium with Atletico yesterday, going down 2-0 to Club Brugge in the Champions League clash.
Father Thierry was interviewed by Het Belang van Limburg ahead of the game - and asked if he had any regrets over his son's career.
He said: "I can name a series, you know.
"That was his favourite team, but it didn't come to a deal.
"Although I wanted Axel to continue playing football close to home in Liege. Regret is not necessary for anything."