The Nigerian moved to Everton from Eupen two years ago.
“I did a medical for Paris St-Germain on a Friday and we had to wait until Monday so they could make both signings [me and another player]official,” Onyekuru told BBC Sport.
“Then I spoke to my friends because I have some good friends, and I asked if it was a good idea to play in Paris and they gave me their opinions.
“I also spoke to my mother and she said she just wants me to play because I’m young and still need to improve, and from there the right club will come.
“So I decided to go with my mother’s advice so I just cut the deal off – just like that. I told my agent to call PSG that we are not going ahead with it.”
Onyekuru continued: “The conversation with my mum helped my decision-making, so it was to a club with better plans for my development.