Barcelona announced the signing of Antoine Griezmann on Friday after the Spanish champions paid La Liga rivals Atletico Madrid the 120 million euro ($135 million) release clause required to sign the World Cup winner. The 28-year-old failed to show up for his side's pre-season gathering on Sunday after he had announced in May he would be leaving the Wanda Metropolitano, even though he could not reveal his destination until his release clause dropped from 200 million euros to 120 million euros at the start of the month.