The deal was drawn up for six seasons, with a league option for a seventh year.
Nieves, who will change numbers, to 26 from 60, is out of minor league options.
"I just think he doesn't know yet," said Pratt, who has minor league options left and is clearly worried.
Yoshii is the only one with minor league options left.
Almonte will be out of minor league options next season, making this year crucial to his future with the Yankees.
The deal included a major league option for 2013.
There are many league options, depending on what kind of group or organization you want to join.
Team ownership is looking into suitable league options for a 2013 return.
Rather, he was one of only two relievers with minor league options.
He has one more year of minor league options.