The 20-year-old hasn't featured for Villa since January's FA Cup defeat to Manchester City and is still a little while away from returning.
Following Sunday's 2-0 defeat to Tottenham, Garde said: "Unfortunately for the team and for me, there is no more news on Jack.
"The doctor told me he had a problem with his ankle and he needed to treat that.
"I am waiting for his return.
"It could be another ten days or two weeks maximum hopefully."