Reserve goalkeeper Jamie Young may be forced to miss the game after sustaining a dead leg whilst playing for the reserves in midweek, giving Hamer his chance.
Although 19-year-old Young is expected to be given a clean bill of health ahead of Saturday's game, youngster Hamer will travel with the squad and could feature in Coppell's matchday sixteen.
However, wingers Glen Little and Bobby Convey will both definitely miss Saturday's match. Little is suffering from a hamstring injury he sustained at Millwall almost two weeks ago and is still some way away from a first team comeback.
Convey meanwhile will be rested as he only arrived back in the UK today after playing for the USA last weekend.
Striker Dean Morgan may also be declared unfit to play any part in Saturday's game after sustaining an injury playing for the reserves. However, the ex-Colchester United man would probably not have been given any more than a place on the bench if fit.
But defender Ibrahima Sonko, who is yet to make a first team start following his summer move from Brentford, will be available.
The Senegal international was sent off whilst playing for the reserves in midweek, but his suspension will not apply to first team fixtures.
Reading, who sit fifth in the league, will be hoping for three points from Saturday's game at Pride Park. After eleven days without a fixture, Steve Coppell's team face a manic seven games in 21 days.