Twins' 2nd baseman Alexi Casilla has a torn tendon in his right thumb and he could be done for the season.  Casilla will see a doctor today that could determine that he needs season ending surgery on the thumb.  The Major League Baseball trading deadline is set for 3pm (Central Time) today and the Twins could be looking for a middle infielder, bullpen help and a righthanded hitting 3rd baseman.  The Twins reportedly spoke with the San Francisco Giants about corner infielder Rich Aurilla.  The Twins are offering pitcher Boof Bonser.  Two other trade possibilities include Kansas City 2nd baseman Mark Grudzielanek and Oakland 2nd baseman Mark Ellis.