The 24-year-old watched the Championship draw against Derby at Molineux on Saturday and joined his new team-mates for training this morning.
Sako becomes Stale Solbakken's seventh summer signing and the Wolves boss is delighted with his latest capture.
"I am very pleased that we have completed the deal to sign Bakary," he told the club's official website.
"He can play on either side and also in behind the striker and has a great left foot, which is something we are missing now in attack.
"He has great experience from playing in a top-six or -seven team in France over the last two seasons and hopefully he can be a match-winner for us."