The Greek league leaders confirmed the move but did not give financial details. Local media said Toure would be paid around 2.5 million euros ($2.9 million) for one season.
A round-up of Wednesday's night's UEFA Chmpions League matches.
New Liverpool boss Juergen Klopp made it three wins from his last three matches with a 1-0 success at Rubin Kazan in Russia that left them second in Group B, two points behind Swiss club Sion on Thursday.
IMAGES from the EPL matches played on Saturday
Barcelona and Atletico Madrid led a Spanish Armada into the Champions League last 16 with home wins on Wednesday and in-form Aaron Ramsey steadied Arsenal's boat with a battling win against rocky Borussia Dortmund.
Manchester United are almost certain to reach the knockout stage of the Champions League after they beat Benfica 2-0 at Old Trafford on Tuesday to make it a perfect four wins in Group A.
Two goals in the first half from Roberto Firmino and Neymar gave Brazil an easy 2-0 victory over the United States in a friendly match in New Jersey on Friday.
Lionel Messi came off the bench to inspire Barcelona to a 3-1 win over a dogged Leganes side on Sunday, creating one goal and scoring another to keep the Catalans five points clear at the top of La Liga.
A summary of Wednesday's matches in the UEFA Champions League.
News of all that's transpired on and off the football field
Andy Murray clinched the Vienna Open title on Sunday with a 5-7, 6-2, 7-5 victory over David Ferrer, one of the Briton's main rivals in the battle to qualify for the ATP World Tour Finals.
A summary of Tuesday night's matches in the UEFA champions League.
Manchester City's all-conquering season reached new peaks as Sergio Aguero became the club's all-time top scorer with a decisive goal in a thrilling 4-2 victory at Napoli that put them into the Champions League last 16 on Wednesday.
Images from the Champions League matches played across Europe on Tuesday
Robert Lewandowski scored a brilliant free kick to give Bayern Munich a 1-0 win over Atletico Madrid in their last Champions League Group D outing on Tuesday, ending the 100 percent record of their opponents. The Poland international curled the ball over the wall and into the corner of the net in the 28th minute but the goal had no impact on the final standings with Atletico guaranteed top spot and Bayern in second place.
News of all that's transpired on and off the football field
Barcelona forward Lionel Messi equalled the Champions League scoring record of 71 goals when he struck for the second time in the 76th minute of Wednesday's Group F match at Ajax Amsterdam.
Photos from the Champions League matches played across Europe on Tuesday.
Cristiano Ronaldo renewed his personal battle with Lionel Messi by scoring his 71st Champions League goal, putting him three behind the Argentine's newly-set record, in Real Madrid's 1-0 win at FC Basel on Wednesday.
