have to double check the IP number -- but the deal Nolasco signed with one of his prior teams (MInnesota?), the one the Angels inherited , had a clause that says if Nolasco pitches X number of innings over a two season ('16/'17) time frame -- then the 'option' for the next season converts from a team option to a player option.
can't remember what the number is -- 450 IP or something like that.
Angels likely want to avoid that.