Spread one side of each slice of toast with caesar dressing.
Place the chicken in a bowl and mix with pesto sauce. Then spread over the dressing side of one slice of bread. Top with shredded lettuce and another slice of bread. Top this with a slice of Swiss cheese, more lettuce and a second slice of Swiss cheese. Cover with the third slice of bread, dressing side down.
To serve, cut the sandwich in half diagonally and secure with cocktail sticks.