I'm assuming that your talking about adult Sasuke. Well, in the naruto verse there are these things called one handed handseals. Only a select few people can do these. These people are. read more
Tobirama Senju, the Second Hokage, only needed to use one hand seal to complete the technique, a testament to his skill. In fact, by Part II, Sasuke Uchiha has managed to master the Chidori to the point of not needing a single hand seal to invoke it and could use Fire Release techniques with only one hand seal. read more
yeah sasuke still make hand seals in one hand but i like to point that the hand seals i trying to say,is some rinnegan handseals jutsu which needs a two hands to function. read more