 FC Kaiserslautern expressed their interest in permanently signing Datsakorn, which also was the skipper of Thailand U-20 at the moment.However, it was reported that Datsakorn refused to extend his contract with the German side as he was homesick.Datsakorn returned to BEC Tero Sasana in the next season 2002-2003 and led the team to AFC Champions League final but lost to UAE's Al Ain 1-2 on aggregate.