The new Arsenal signing has taken heat in recent days for his performance at Euro 2012, which saw him score just one goal and fail to provide a single assist in Germany's run to the semi-finals.
And after Podolski was benched for the last eight tie against Greece, Doll felt that his re-introduction in the next round against Italy was unnecessary.
"In such a semi-final, only the best must play," he told Sport1, asserting that Podolski was not worthy of his starting berth.
Helmer as well was baffled with Low's selection of the forward, who for a third time failed to score as Italy knocked out Germany with a 2-1 win.
"Podolski sits out the game against Greece, then comes in [against Italy] and plays just as he did before. I absolutely do not understand this," the 68-cap Germany defender said.
Doll and Helmer's comments come one day after Wolfsburg coach Felix Magath slammed the German team for lacking fighting spirit as they fell short in the Italy match.