MADRID, Aug 31 (Reuters) - Atletico Madrid on Tuesday sensationally announced they had re-signed French forward Antoine Griezmann on a season-long loan from Barcelona, with the option to make it a two-season deal. In one of the most eye-catching moves on Europe"s deadline day, Atletico secured the return of a player they sold for a reported 120 million euros ($141.7 million) in 2019. ($1 = 0.8469 euros)