According to industry sources, the Cubs have agreed to terms with shortstop Yonathan Perlaza, ranked No. 13 on MLB.com’s Top 30 International Prospects list, for $1.3 million, outfielder Yonathan Sierra Estiwal, ranked No. 16, for $2.5 million, shortstop Aramis Ademan, ranked No. 19, for $2 million, Panamanian catcher Miguel Amaya, ranked No. 25, for a deal worth $1.25 million and third baseman Christopher Martinez, ranked No. 28, for $1 million.