Preheat panini griddle over medium heat. Cook chicken breast on the griddle for 5 minutes, flip. Cook for additional 4-5 minutes or until cooked through. Remove chicken. Slice into thin strips. Set aside.
Brush both slices of bread with olive oil on one side. Sprinkle oiled side with Italian seasoning. Working quickly place oiled side down on hot griddle. Top with grilled chicken and Caesar salad dressing, tomato and basil. (Feel free to reserve basil and tomato for after it comes off the griddle if desired.) Top with the other slice of bread, oiled side up.
Grill until browned and heated through.Enjoy!