Ferguson:
"Mikael has been an important member of the squad for seven years now.
"His experience at the club will help the younger players as they develop and he has a central role to play in the first team.
About Park:
"I am pleased to have secured him to the end of the decade at least.
"He has adapted well to the Premiership and is probably the best off-the-ball player we have.
"His movement and awareness is fantastic and he has been blessed with good stamina, a great attitude and good character."