Kerr’s return has been a long time coming.
Bompastor, over the past six months, has fended off questions about when the Australia captain would be back in action.
She did not play during Bompastor’s first season as manager last term but has effortlessly slotted straight in despite a lengthy spell out injured.
Kerr wrapped up her return with a typical centre-forward goal, pouncing on the ball following a goalmouth scramble before carefully blasting past Roebuck.
There were more positives to take for Bompastor as Thompson, signed for just under £1m this month, looked bright on her debut.
Had Erin Cuthbert managed to keep her volley from close range down, the American would have grabbed an assist on her WSL bow.
But the Chelsea boss is unlikely to be content with the overall performance at Villa Park as the hosts were the better team for large portions of the game.