Liverpool were in talks to sign the 26-year-old in a 60m euro (£52.75m) move last summer but the move collapsed.

The deal for Fekir, who had entered the final year of his Lyon deal, includes 10 euros (£9m) in add-ons and a 20% sell on clause.

He came on as a France substitute in their World Cup final win over Croatia.

Having come through the youth ranks at Lyon, he played nearly 200 matches for them and scored 69 goals.

"With the arrival of Fekir, Real Betis acquire creativity, great technique, shooting ability and attacking edge," said a Betis statement.

Lyon added: "Olympique Lyonnais thank Nabil for all he has brought to the club, for his professionalism and especially for his involvement in the professional group as team captain."