The 21-year-old, who joined City aged just 16 in 2008, scored 20 goals in 23 league appearances during a loan spell with the Dutch outfit in the 2011-2012 campaign.
"Guidetti is in our hearts and the door is always open for him," Van Geel told newspaper AD.
"If a godsend occurs, we would naturally increase our squad with him. But I would like to say clearly that no concrete efforts have been made to get him."
Guidetti is currently with the City squad on their pre-season tour of South Africa.