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He looked particularly out-of-sorts against Blackpool last week and was replaced by Neil Roberts during the second half.
Jewell, though, has every confidence in the striker he paid a club record £1.2m for just under a year ago.
He believes Ellington's misfiring in front of goal is down to him trying too hard rather than a crisis of confidence.
And the manager's faith in the 21-year-old is likely to be shown at Gresty Road when he names him in the starting line-up.
Jewell said: "I don't think the Duke is low on confidence.
"He shouldn't be because he's only two games without a goal, and I just think he's maybe trying too hard.
"With a bit more composure the goals will start flowing again, and remember, he's only young and for all his talent isn't an overly experienced footballer.
"I brought him off against Blackpool as he appeared to be a bit down on himself and I thought we might benefit from a change.
"But I'm sure the Duke will be back at it again on Saturday when we go to Crewe.
"Sometimes, chances just don't go in for you.
"Look at Michael Owen, he's one of the best in Europe but even he can't buy a goal for Liverpool at the moment."
Although Ellington is Latics' leading scorer with 18 goals in all competitions, he has tended to find the net in fits and bursts.
Early on in the season he hit a barren spell but then responded with nine goals in seven matches.
Then after a nine match drought stretching from the end of October and throughout November, the former Bristol Rovers hitman found the net five times in three games.
Ellington's dip in form has led to calls from some supporters for Jewell to buy another striker to help spread the scoring burden.
But while the manager is continually on the look out for fresh talent to add to the squad, he won't buy just for the sake of it.
Meanwhile, Jewell's assistant Chris Hutchings believes the key to success on Saturday is to stop Crewe playing their passing game.
The Railwaymen are regarded as the best passing side in the division but a bit of rough and tumble could knock them out of their stride.
Hutchings said: "Crewe are an excellent footballing side and we have to make sure we get in their faces and close them down.
"If you allow them to pass it, they will play any team in this division off the park.
"It's important we do our homework on them and get at them, but saying that, we can play some decent stuff too.
"If we hold our nerve down there and play to our potential, we should be okay."
Article from the Wigan Evening Post.