The winger’s management company have apologised for the “inconvenience and worry” caused to the cyclist, who is reported to have suffered bruising.
A report from Japan stated a female cyclist was knocked from her bike by Mitoma’s car at a junction in Tokyo.
Mitoma’s representatives issued a statement, reading: "We sincerely apologise for the great inconvenience and worry caused to the injured party and all those involved in the accident.
"Mr Mitoma himself takes this accident very seriously and is responding with feelings of sympathy and apology to the injured party.
“The injured party has been examined at a medical institution and diagnosed with bruises, and Mr Mitoma was not injured.
“We will inform you again if any further information becomes available.
"We take this matter very seriously and will fully cooperate with the investigation by the relevant authorities.
“We will also strive to thoroughly instil safe driving awareness and strengthen compliance education to prevent recurrence.
“Once again, we offer our deepest apologies to the victim, their family, and all those involved."
Mitoma is reported to have checked on the cyclist’s condition and followed the instructions of the police who arrived at the scene
An Albion spokesperson said: “The club are aware of the situation and we are pleased to hear that nobody has suffered any significant injury.
“We will be available to Kaoru for any support he needs.”
Mitoma has been at home in Japan after missing the World Cup with a hamstring injury.