The 25-year-old midfielder could play at Anfield on Saturday after making miraculous recovery from a hamstring injury.
Gana, 25, has missed Villa’s past three games after injuring his hamstring in Senegal’s 2-0 win over Namibia earlier this month and flew out to France last week in order to receive specialist treatment.
He has since returned to full training sooner than expected and there is now even a chance that he could start at Anfield, with Sherwood telling reporters: “Gana is training. He might be playing tomorrow. The specialist got a magic wand out. I think his name was Paul Daniels!
"He has been a revelation since he's come in. He is one of the new guys who has been outstanding. I'm really calm about the situation, I won't panic. Idrissa has probably been the best purchase."
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Gabby Agbonlahor, though, has not trained since coming off at half-time of Tuesday night’s 1-0 Capital One Cup victory over Birmingham City with a calf injury and, while Sherwood believes there is a chance that he could still make the Liverpool clash, the long-serving striker remains a doubt.
Adama Traore is also nearing a return from the ankle problem which has kept him sidelined since last month’s 5-3 win over Notts County in the second round of the competition but it remains to be seen whether he will be available for the weekend.
“Gabby might be alright but he is a doubt. He hasn’t trained yet,” said Sherwood. "Adama is training, we'll see how he comes [through] all that, the work with the balls. He gives us a spark.
"They are definitely in my thoughts but only 11 can play.”
Meanwhile, Sherwood also revealed that Gary Gardner is set to resume training next week for the first time since injuring his ankle in Villa’s pre-season encounter with Swindon Town, while Jores Okore is making good progress from the knee operation he underwent in the summer.
“Okore is still working on his fitness and Gary Gardner is going to start training on Monday," he added. "That's pretty much it on the injury side so we're not too bad.
"Hopefully we can keep them fit and get them physically fitter to be ready for selection."