Saracens have added hulking Scotland second-row Jim Hamilton to their squad alongside Sevens star Mike Ellery for next season.
Highly-rated Argentine tighthead Juan Figallo also joins the Premiership table-toppers.
"Last year we identified a handful of players who we felt would improve what is now a stable, successful and developing squad," revealed Director of Rugby Mark McCall.
"After long and detailed negotiations, we are pleased to have finally secured each of our targets.
"Juan Figallo was ranked as the world's number one tighthead prop last year and, aged only 26, will prove a massively significant signing.
"He has almost completed rehab following a neck injury and will be ready for the start of the new season.
"Jim Hamilton is one of the most respected lock forwards in the game, a big man with a big presence on and off the field. He was courted by several leading European clubs, and we are delighted he has chosen to join Saracens.
"Mike Ellery is a tall, strong man with both skill and speed. He has been making headlines on the Sevens circuit, and we are looking forward to helping him realise his full potential in the 15-man game."