Dean Smith needs forward reinforcements after Wesley was ruled out for the rest of the season.
"It's absolutely crucial (they get their business right)," Hendrie told Sky Sports.
"They spent over £100m in the summer transfer window.
"Lots of clubs do panic buy (in January), they try to bring players in that are going to be suitable and fit the bill for the Premier League and the club.
"Aston Villa have been linked with so many players so it's so crucial they bring in the right personnel.
"There's also talk of Giroud and Sturridge, personally I'd go out and get the two of them if possible. I suppose that's just down to what funds are available and obviously we can't state the goalkeeper enough.
"Tom Heaton (being out) is a massive blow at such a crucial stage of the season. You want players who are going to be available and unfortunately, at the moment Villa have been hampered with injuries to key players so they've got to be shrewd in this January transfer window.
"I would like to see two centre forwards coming in and make a big impact.
"Two centre forwards would be ideal because that is the area that they've struggled and they've had to rely on the likes of Jack Grealish, who is the top scorer at the club."