Harlequins have signed Wales hooker Scott Baldwin and Italy centre Michele Campagnaro for next season.
Baldwin, 30, will move from Welsh side Ospreys, and Campagnaro, 26, will join from Quins' Premiership rivals Wasps.
Baldwin spent 10 years with Ospreys, making more than 120 appearances and helping them win the Pro 14 in 2012.
"There is something special going on at Harlequins and I am looking forward to starting my Premiership career there," Baldwin, capped 34 times, said.
Harlequins head of rugby Paul Gustard added: "We have followed him [Baldwin] in the Pro14 and he has impressed with his attitude, his humour and all-round technical ability. We know he will be a great fit and a key member of the squad as we look to improve and fulfil our ambitions."
Campagnaro has played seven times for Wasps since joining them from Exeter in December, where he won the Premiership title in 2016-17.
He broke his foot on international duty during the Six Nations, and will be out for up to 12 weeks.
"He [Campagnaro] is a fantastic talent, powerful through contact and will give us even more of an attacking threat next season," Gustard added.