Swindon have ended Zavon Hines' trial at the County Ground after only two days due to the striker's lack of fitness.
Hines, 23, is a free agent after his contract at Burnley expired at the end of last season.
Town manager Paolo Di Canio told BBC Radio Wiltshire: "I can't give him 40 days for pre-season.
"It's my opinion - I don't want to put him in trouble. He's just far from our level of fitness.
"We said to him it wasn't fair to keep him here for seven days. I don't think now I can find players who have the level of fitness that my players do."