I like to change the shape from game to game or even within games, so he will fit perfectly for us.Aitor Karanka
The Spanish forward joined up with new teammates for the first time on Saturday following his move from Elche at the end of last month.
Sanchez is understandably an unknown quantity to most fans in England, but his fellow compatriot Karanka is big fan of his abilities and believes his signing is a coup for Blues.
"In Spain he had a lot of offers from clubs he could go to, so we are pleased to bring him here which is nice," said Blues' Head Coach Karanka.
"He is a talented player. He is a left-footer and he can play in a lot of positions.
"He can play as a winger, he can play as number 10, he finished the season almost playing as a number 8.
"He is one of those players that is versatile.
"For me that is important because I like to change the shape from game to game or even within games, so he will fit perfectly for us."