Chicksen missed the midweek win over Colchester with an ankle injury and skipper Lewington was forced off early in the second half of that game after he suffered a recurrence of a knee injury that recently keep him sidelined for three weeks.
If both players miss out on Saturday, Dons boss Karl Robinson will have to shuffle his pack to find a left-back for the fixture.
Goalkeeper David Martin remains sidelined with the back injury that has kept him out for the past two months.
The Dons must win to take their faint hopes of making the play-offs to the final game of the season, but even then Robinson's side have to hope that sixth-placed Swindon do not win at home to Stevenage.
- Sports & Recreation
- Karl Robinson