But he insists Cassano is unlikely to play against Lazio.
Cassano hasn't played since their training ground row last year and Del Neri said: "Sure Cassano could be selected, but it will take between 15 and 20 days before he will be completely better.
"It's really for this reason that we have organised a programme of work for him. Antonio met the fitness staff yesterday.
"We have decided to do a mini pre-season for him that will ensure he won't suffer when he gets back on the pitch."