The coach said he is highly confident star forward Jeremy Cameron will remain with the club but was less optimistic regarding gun ball-carrier Zac Williams. Both men are free agents and highly sought after.
The Giants also face a battle to retain the services of their top three picks from the 2018 draft Jye Caldwell, Jackson Hately and Xavier O'Halloran.
There will be changes to their coaching panel with Lenny Hayes and Brad Miller leaving.
Veterans Shane Mumford and Heath Shaw may have played their last game.
The Giants were premiership favourites early in the season but their premiership bid hit the skids after they headed west, winning just two of their final seven games.
"It's a year we probably didn't adjust to what we needed to and that's where we ended up," Cameron said.
"It's a disappointing year. We spoke to our boys then, we need to regain the respect of the footy world.
"We're not into playing home-and-away and not playing finals. And we've done that pretty well the last four years. Our effort and our consistent performances hasn't been there.
"So we have to look at everything of what's gone wrong and make sure we correct it in the summer period to make sure we're ready to go in 2021."
The Giants needed to beat the Saints to have any hope of making the finals but were held goalless after half-time.
"Where do you start, one big disappointing season really, really didn't get going at all," Cameron said.
"Even tonight, first half, all indicators clearly should be game closer or even in front but our kicking was terrible, our decision making inside 50.
"Really disappointing after half-time because the boys just, I hadn't seen that happen for a long time. They probably just summed up our year the second half.
"Our normal fight and finding ways to win games, doesn't matter whether you're interstate or in Queensland in a hub, wasn't there.
"It was really disappointing, the last three weeks your season's on the line, you get beaten by 11 points, five points and we probably conceded and rolled over in the last half tonight."
Spearhead Cameron signed off on arguably his worst season with just one behind, and faces a major decision on his future. He was offered a long-term deal at the start of the year but his management's counter-offer is reportedly some distance apart.
Cameron, who learned on Friday his great-grandfather had passed away, is from Victoria but his family lives in Mount Gambier in South Australia, and he did not return home during lockdown.
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"In terms of my confidence I'm really confident he wants to be at the footy club," the coach said.
"He's had a challenging year, he had a challenging night tonight with some bad news before we got on the bus. He's been under the pump.
"One thing I reckon it's hard to judge is his effort. His effort hasn't shown his output.
"I understand he's kicked a lot of goals the last six or seven years and we do judge players on his output but I can't question his effort, and probably at times he's tried too hard in a tough six months for him, but really confident he'll be at our footy club."
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Andrew Wu writes on cricket and AFL for The Sydney Morning Herald