In this moment at least Spezia and Verona on paper face difficult opponents, so it is highly likely that Spezia and Verona will lose. But yes, because Milan's position is also 100% safe to still finish in the top four, it is likely that Verona will be able to take advantage of this opportunity to beat Milan. Except, Milan still has a target to overtake Inter in third place, so it is certain that Milan and Roma will win. But speaking of Juventus, it looks like Juventus will not be easy to beat Udinese.
Teams that a desperate to escape preparation can be unpredictable. Unfortunately, Spezia and Verona are playing against top teams in their quest to avoid relegation. Milan are have already qualified for the Champions League so they might decide to rest their major players and give opportunities to some irregular players. So the possibility of Verona getting at least a draw in Sunday's game is high. But Roma will come all out to win the game against Spezia.
I have already said that Verona still has a chance to beat or draw against Milan. Unless, if Milan is still ambitious to overtake Inter then of course Milan will also continue to play seriously to win. Because anyway, even though Milan have finished in the top four but this is the last match and thus, resting the main players is also pointless because in this last match they could have played to their full potential to close the season with a sweet victory.