The German coach has admitted he was too harsh on his left back after implying the defender needed more time to improve before he would be good enough for the team.
"Schmelzer did not have a good game [against Austria]. Many of the alternatives are not ready, we have to keep working with Schmelzer for the next two, three, four or five months,” Low said to reporters.
After Germany's 6-1 win over the Republic of Ireland, Low has retracted those comments, though, and he says he has personally apologized to the Dortmund player.
"I've looked at everything I said again and have to admit I have come across very harsh. I have apologized to him [Schmelzer] for this," Low said.
The Germany boss also stressed the importance of having a strong bench coming into the team's game against Sweden on Tuesday, and Low made it clear he would not underestimate his next opponents.
"There's always a time where you have an Iniesta on the bench, a Torres or a Villa," Low said, using European rival Spain as an example. "You need a strong bench. It also has to be noted that Sweden are a team with a lot of organization and are very, very strong."