Wilshere was left out of the Gunners starting line-up for the goalless draw at Aston Villa and was an unused substitute.
When asked how the England international was progressing, Wenger said: "First, it's a relief that he's had no setback (since returning to action).
"He had a little bit of inflammation of scar tissue (in the ankle) but it's nothing. It's very minor.
"The rest (against Villa) will help him get rid of it. Apart from that, he has done very well.
"He has not played for 17 months. People forget what that mean. Seventeen months in a career is massive.
"But I'm very happy with the way he is progressing."