There are reports Georgios Samaras has failed a medical with Sampdoria.
The striker is a free agent and agreed personal terms worth €0.75m per season plus bonuses.
He underwent a medical today, but Sky Sport Italia claim the results were not entirely reassuring.
Samaras would not be ready to start the Serie A season on the weekend of August 22.
President Massimo Ferrero is therefore considering the situation carefully before committing to a contract.
He has other issues to deal with amid reports Coach Walter Zenga will be sacked after a humiliating 4-0 Europa League defeat to Vojvodina.