"Tottenham played well but we came back, which gives us confidence.
"They had more chances than we had, but when they scored we had a mental blow and struggled to recover from that.
"But for me it's a positive result."
Wenger vowed to resist the temptation to recall his first-choice stars for the return.
"We have made decisions that will stand for the second leg," he added.
"I'm convinced we can do it"