The deal is reportedly worth $7.05 million.
Raffl would have been an unrestricted free agent this summer if he had not signed the deal.
Raffl has eight goals and nine assists in 61 games this season. In his career, he has 38 goals and 29 assists in 196 games.
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The Chicago Blackhawks agreed to terms with goaltender Mac Carruth on a one-year contract, which runs through the end of the 2015-16 NHL season.
Carruth, 23, has posted a 0-2-1 record with a 3.32 goals-against average and .882 save percentage in six games with the Rockford IceHogs of the American Hockey League this season.
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The Kings made the move retroactive to Feb. 18. The club didn't disclose the nature of Nolan's injury.
Nolan, 26, had five points (all assists) in 52 games this season.
Nolan has played in 246 career NHL games over five season and has 16 goals and 18 assists.
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Carolina received center Aleksi Saarela and two second-round draft picks in return. One of the choices will be in 2016 and the other in 2017.
Staal, 31, is in the final season of a seven-year, $55.75 million deal and is eligible to become an unrestricted free agent after the season. He has 322 goals and 453 assists for 775 career points, all with Carolina over parts of 12 seasons. (Editing by Andrew Both)