Leicester City ran out 3-2 winners at the King Power Stadium on Sunday.
The Villans were two goals up with 18 minutes remaining before a late collapse gifted the Foxes all three points and Sinclair pointed to their lack of game-management know-how as the main reason.
“Although they were 2-0 up, I thought the scoreline wasn't a true reflection of the game - I still thought Leicester were dangerous,” Sinclair told Sky Sports.
“Villa were a team who didn't have the savviness to see out a game by keeping possession. They were a bit naive. If you score two goals away from home you should be coming away with something.”
Tim Sherwood’s men certainly should have seen out the game or at the very least left with a point, but with such a young and new-look side, growing pains are inevitable.
Joleon Lescott was brought in to add much-needed experience but his inclusion seemed to have had a destabilising effect - after breaking up the developing Micah Richards and Ciaran Clark pairing – while the presence of Idrissa Gueye was sorely missed.
Despite the painful result, there are plenty of positives for Sherwood and the Villa faithful to take comfort in.
For 70-odd minutes they put on a solid performance at one of the toughest grounds in the Premier League and in Jack Grealish and Carles Gil have two players sure to blossom this season.
The talent and hunger is clearly there in the Villa squad and Tim Sherwood will be confident his team can get throw this initial stick spell.