Sheffield United have signed Derby midfielder Ben Davies on a one-year deal, while striker Chris Porter has agreed a new 12-month contract.
Davies, 33, ended last season on loan with the League One side, scoring three goals in 20 appearances.
Porter, 30, joined the Blades from the Rams in July 2011 and has 23 goals in 113 games for the club.
"They are well known to us and we're delighted they're on board for next season," boss Nigel Clough said.
Davies was out of contract with Derby and his return to Bramall Lane follows last week's signings of Blackpool midfielder Chris Basham and Walsall centre-back Andy Butler.
Former Bury and Motherwell man Porter said he was delighted to have extended his stay with last season's FA Cup semi-finalists.
"There was some interest from other clubs but I've loved it since I've been here," he told BBC Radio Sheffield.
"It wasn't just about money. This is a great club and one that I think is going places and I want to be part of something special.
"I feel like I'm quite a loyal person and I'm happy off the pitch here too. Hopefully I can earn another deal at some point in this season."