Amauri enjoyed an impressive loan spell last season at Parma.
"He is a player who can't be questioned," Ghirardi told Sky Sport Italia. "He left an indelible memory here.
"However, there are not the conditions in place to sign him this season.
"We invested a lot in Sergio Floccari over the summer and we've only been able to take advantage of him for two or three games because of injuries.
"However, we are well covered in attack with Graziano Pelle, Jonathan Biabiany and Sebastian Giovinco."