Yoshitomo Tsutsugo hurt his left ankle while running the bases in an exhibition game against Hiroshima on Sunday. He went to a hospital in Yokohama today for a full exam and was diagnosed with a sprain in the outer portion of his left ankle. Details on his recovery were not released, but he could end up missing the start of the season.
Tsutsugo missed the start of the season for the same exact reason (he sprained his left ankle during spring camp).
Source: Sponichi 3/11/2013