I just know that Olivera featured on the official team sheet last year, and the ones who've been officially released have all been removed (Zenoni, Baiocco, Salas). Those who have had press conferences as new purchases (Legro, Appiah and Miccoli) have all been added.
Olivera has been said to be going from the start of this mercato, and we thought an agreement had been reached with Empoli. It makes sense that he could have been removed too. Maresca is the only one not there. Just like he is the only one neither Moggi or Lippi has really mentioned among new players in the team.
Obviously I'm extra worried because he's one of my faves, but it's still very odd.
I wouldn't get riled up about what's on the website. Check lega's files and you should know, the official site isn't exactly up to date at all times and it takes them ages to add new players. The guy probably didn't even realize Maresca should be added as there was no press conference in his favor...
All our players are on that list except Matresca, and I dont know why he would have been left out if he wasnt going to be sold/loaned. I read somewhere he might go to Udine in excange for Pizzaro, who would then go to Lazio in excange for Stanković.