Charlton boss Karl Robinson was in attendance as Shrewsbury drew against Gillingham on Tuesday.
Paul Hurst’s side conceded a late equaliser and travel to the Valley with just one win in four games.
But Charlton are one bad result away from slipping out of the top six with Plymouth, Bradford and Portsmouth breathing down their necks.
Robinson, who will have a near fully fit squad to choose from on Saturday, said: “I went to watch Shrewsbury on Tuesday, what an unbelievable and honest team.
“They're very hard working and very well coached. There are very few flaws in their game. I know they rested one or two players, and they'll be back in for Saturday.
“We’re really excited by it. It’s one of the best managerial jobs of the year bar none. It’s incredible what he [Hurst] has achieved. We’ve got to be ready.”
MORE: Charlton manager reveals selection headache ahead of Shrewsbury game
Shrewsbury have been the surprise package in League One this season. They are battling Wigan and Blackburn for a top-two place.
Robinson added: “They've 100 per cent surprised me. Regardless of the outcome of their season if they get automatic promotion or play-offs, you've got to take your hat off to them.
“You look around the league, I don't think many people can look at anything better than what they've achieved.
“Okay, they've kept the same players fit, they made a few changes on Tuesday. But theoretically, they've kept the team, same shape and just rolled them out week in, week out.
“They’re very well drilled and coached. People say it’s just about the work ethic, but you can see how well they've been coached.”
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