The management of the 18-year-old, with career wins over Rafael Nadal and Andy Murray, announced the appointment as Coric played at this week’s Estoril Open, where he has reached the second round and faces Portugal’s Rui Machado on Thursday.
Johansson, 40, who retired in 2009, recently had a coaching trial with former WTA number one Caroline Wozniacki. He has also served as tournament director of the Stockholm Open ATP tournament.
Coric, ranked 55th, is the youngest player in the ATP top 100.
“I’m ??happy ??to ??start ??working ??with ??Thomas. ??He ??has ??been ??around ??on ??the ??ATP ??Tour ??for many years and has the experience and knowledge to help me achieve my goals,” said the teenager in a statement.
“Having a Grand Slam winner in my team will mean a lot to me.”
Johansson said: “Borna has been one of the leaders of the new generation ??we ??all ??have ??been ??waiting ??for ??in ??the men’s ??tennis.??
“His ??energy ??and ??tennis capabilities are impeccable and sometimes I forget he is only 18 years old. We will work on ??all ??aspects ??of ??his ??game ??and ??he ??will ??hopefully ??continue ??improving ??in ??the ??years ??to follow.”