Lewington wants on-loan Webber to remain with the Hornets squad for the rest of the season. He said: "We haven't spoken to Man Utd about extending his deal as yet but it comes to an end in November and we are hopeful we can sort it out.
"Alex Ferguson said at the start of this that three months was the maximum at that time, so we'll have to see what the situation is now. If we can extend it we'll be very happy indeed."
"Danny does a hell of a lot of work outside and around the box and creates a lot of chances for himself," the Watford boss added.
"Sometimes he chooses the wrong options but you'll always go with Dan because he brings so much into every game."