The 19-year-old picked up an ankle injury in the 5-3 Capital One Cup win over Notts County in August, when he scored his first goal for the club before being forced off in the second half, and has since been slow to recover from the issue.
However, the two-week international break gave the £7 million summer signing from Barcelona the chance to benefit from some intense workouts along with Jack Grealish, who missed the entire pre-season with a hamstring problem, and Sherwood is looking forward to having them both back at 100 per cent going forward.
"Adama has been out for a long period of time,” said the Villa boss. “And there are a few players who missed pre-season - Jack Grealish, for instance. We have used this international break to get them fit.
"We have had two games behind closed doors - they played in both. They have done very well."
After undergoing knee surgery in the summer, Jores Okore is another player who has benefited from the break but Sherwood stressed that the Danish centre-back is not quite fit enough to make a first-team return, adding: "Jores is training a lot more now. But he's not quite ready to play."
Gabby Agbonlahor and Ciaran Clark have also been ruled out of Saturday’s game at Stamford Bridge, having both missed games before the international break with calf injuries.
In addition, Carlos Sanchez only returned from international duty with Colombia late on Thursday, leaving some doubt over his status for the clash with Jose Mourinho’s men.
“Gabby is not fit. Ciaran is still injured too,” said Sherwood. "Carlos only came back last night. We will have to assess how he is. He's fit but obviously will be very fatigued."