Calhanoglu slammed Son for missing training prio to his move to Tottenahm, the Korean star replied by saying ‘people who live in glass houses should not throw stones’.
The South Korea international explained that Calhanoglu also upset many fans when he moved from HSV to Bayer Leverkusen.
“Calhanoglu also made some noise when he was moving from Hamburg to Leverkusen,” Son told the Korea Joongang Daily.
“That’s why I said, “Wer im Glashaus sitzt, soll nicht im Steinen werfen” (People who live in glass houses should not throw stones), to the German media.”
Çalhanoğlu joined Bayer on a €15 million move for HSV Hamburg last summer despite his former club wanting him to stay on.
Bayer secured a place in the Champions League group stages yesterday after beating Lazio 3-1 on aggregate. The Turkish international scored the opening goal against the Serie A outfit.
Çalhanoğlu already has two goals to his name this season, the free-kick master scored his 22nd set-piece goal against Hannover 96 last week.
The 21-year-old is expected to start against the newly promoted Darmstadt 98 next on 12 September in the Bundesliga.