"In the second half we created plenty of chances - enough to win any game - but if you don't take them you won't get anywhere."
The Hornets were forced into an early change at Highfield Road when goalkeeper Richard Lee came off his line well to block but paid the ultimate price, colliding with his own defender James Chambers.
Lee was stretchered off to be replaced by Alec Chamberlain and Lewington said: "We'll have to wait and see how Richard is. If there is a problem, we'll have to bring in another keeper."