Villa could only pick up a 2-2 draw with QPR in front of their own supporters, despite taking the lead in the contest.
Smith’s side struggled to show their best throughout the game, and the Villa boss felt that his central midfielders were showing signs of fatigue.
He said: “I thought he amount of games in a short space of time took their toll on Conor and John McGinn. It wasn’t their best performances for us, and they’ve been doing really well.”
Villa have had a busy fixture schedule of late, and their squad has been exposed.
Smith’s men have conceded far too many goals, which has hurt their form.
Villa have won just once in their last six outings, with their push for the play offs stuttering.
The claret and blues are now expected to make additions over January, as they look to catch up with the top six.
Villa are next in action at the weekend, when they take on Swansea City in the FA Cup.
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