Diame has signed a three-year deal with the Championship club after Newcastle met the player's £4.5m release clause in his contract at Hull.
Clark has joined the Magpies on a five-year deal after spending his entire career at Aston Villa. The Republic of Ireland international has joined for a fee of £5m.
CONFIRMED! Mohamed Diamé is a Magpie!#MagpieMo #NUFC pic.twitter.com/O9W0bKPemQ
— Newcastle United FC (@NUFC) August 3, 2016
The full story as Newcastle United capture Ciaran Clark
— Newcastle United FC (@NUFC) August 3, 2016
https://t.co/mHLQGgZCef #WelcomeCiaran #NUFC pic.twitter.com/7vjGjoDYRp