Chelsea regret selling Kevin De Bruyne to Wolfsburg, claims the German club's general manager Klaus Allofs.
The Belgian moved to Stamford Bridge from Genk in January 2012 but spent the next 18 months on loan to both his former side and Werder Bremen, where he scored 10 goals in 34 Bundesliga appearances.
De Bruyne returned to his parent club at the start of the 2013-14 campaign, but played only three times in the Premier League before being sold to Wolfsburg for £17m - a £10m profit - a year ago.
The playmaker scored twice in the Wolves' 4-1 mauling of Bayern Munich last month - causing the Blues to question their decision to offload him, Allofs claims.
"They've seen it confirmed why they were reluctant to let him leave."
The 23-year-old has scored eight goals and assisted 11 others in the Bundesliga this season, catalysing Dieter Hecker's men - who trail Bayern by eight points in second place - into genuine title contenders.