Laing was hurt in Tuesday's win over the New York Rangers. He had metal plates inserted into his jaw during surgery.
Semin missed the Rangers game and was wearing a brace on his wrist Wednesday. An MRI exam revealed no serious damage.
Goaltender Jose Theodore was at practice after missing Tuesday's game due to personal matters, but his status is uncertain for Friday's game against Montreal.
Alex Ovechkin also practiced, showing no obvious effects from the injury that caused him to miss six games. The two-time reigning league MVP scored a goal Tuesday in his first game back.