The Cats are planning to settle on their pre-draft list in the coming week, with ruckman Orren Stephenson likely to be an unlucky casualty.
Stephenson was awarded a one-year contract after being the shock selection in last year's national draft.
The 30-year-old played eight AFL games for Geelong during the 2012 season, with his best performances coming against Collingwood in round eight and Hawthorn in round 19.
But he has been squeezed out by the Cats' decision to bring McIntosh across from North Melbourne.
Geelong will now have a quiet national draft, with much of the club's focus going into who it will select with its first-round pick, which is currently selection 15.
All clubs are required to have three places on their list open in the lead-up to the draft, but the Cats have already committed one of them to elevating rookie-listed midfielder Jesse Stringer.
"The picks that we have are still to be finalised - there's still a week to go of the trading - but whatever picks we do have, we'll be working very hard to call out the right name," list manager Stephen Wells told geelongcats.com.au.
Wells and his list management team secured McIntosh on a three-year contract after handing over the club's second-round draft selection - currently No. 36.
"Hamish is really looking forward to getting his body right and making a big contribution to Geelong," Wells said.?
Rivers, meanwhile, became the club's first free agency acquisition after signing a two-year deal.
His arrival means the Cats won't be granted any compensation for losing two-time premiership half-forward Shannon Byrnes to Melbourne earlier in the free agency period.
"It's nice to be able to bring Jared along," Wells said. "But it was a really big decision for the club because our list is tight.
"He's had a terrific career with Melbourne, and Melbourne still wanted Jared to stay there, but in the end we were able to make him an offer that fitted into our TPP (Total Player Payments) allowance from the AFL."
Both Rivers and McIntosh are 28, and both have agreed to play a role in developing the Cats' talented group of youngsters.
"They were fellas that wanted to play very well and were looking forward to the opportunity of a new club," Wells said.
"But they were also very keen to work with our young players that play in similar positions to what they do.
"Jared, with his experience in the backline, will be a tremendous help to the young guys down there, as well as Harry Taylor and Tom Lonergan.
"Hamish McIntosh will be working closely with big Dawson Simpson and helping Trent West and Nathan Vardy, those sort of players, become even better ruckmen."
The Caddy deal was finalised when Gold Coast agreed to accept Geelong's third-round pick - currently No.55 - to go with the Gary Ablett compensation selection that had already been handed over.??"It fair to say that with all three deals finalised today, their clubs were really good to deal with - very fair and we hope it is a great result for the players and the clubs," Wells said.
Adam McNicol covers Geelong news for AFL.com.au. Follow him on Twitter at @AFL_AdamMcNicol
