Coach Milutin Sredojević was spotted in the stands watching the Black Stars beat the Club side in a low profile friendly last Tuesday.
This comes after the Serbian tactician (Mitch) had indicated he knows the Black Stars to well after his side held the West Africans to a goalless stalemate in a World Cup qualifier at the Tamale Sports Stadium.
Grant in an interview took a gibe at his colleague for spying on his team having hinted he knows all about the team.
"You claim to know everything about my team so why did you come to spy on us again,” the former Chelsea boss said.
Ghana will take on the Cranes in the opening Group D match at the Cup of Nations on Tuesday.
The Black Stars have failed to beat their counterparts in the last three meetings.