However, the 20-year-old has since put pen to paper on a move to Everton – becoming the club’s third summer signing.
And he has now acknowledged the move on his personal Instagram account, posting a photo of himself posing with the Everton crest.
The Toffees are yet to officially confirm on their club channels the news that Onyekuru will be playing at Goodison Park next season.
The Nigeria striker finished last season as the joint leading scorer in the Belgian Super League with 22 goals in 38 games – 10 of those came in the final 10 games.
His form was so good that he won his first international cap at the end of the campaign for Nigeria.
Arsenal had been regarded as leading the chase for the footballer but Everton trumped the Gunners by negotiating a deal with the player’s club KAS Eupen that will see Onyekuru spend a season on loan with Anderlecht before coming to the Premier League.
Everton feels another season spent with Anderlecht, who will be playing in the Champions League, will be significant for Onyekuru’s development and he will arrive at Goodison Park in 12 months a much more polished forward.