Drafted as a shortstop with the Cubs' 43rd-round selection last year, Morel hit .303 with 18 RBIs in 46 games with Riverside this spring.
Hatley, drafted as an outfielder with the Cubs' 39th-round selection a year ago, batted .290 with three home runs and 31 RBIs in 41 games with Palomar this spring.
A right-hander, he also made two appearances in relief, tossing 2 2/3 innings combined. Cubs Scouting Director Tim Wilken said Wednesday that Hatley will join the organization as a pitcher.
"He's got a big arm and it's pretty untapped," Palomar head coach Buck Taylor said of Hatley. "He's got a breaking ball and it's a big league out-pitch. He's also got a slider that he throws. Velocity-wise and breaking ball wise, he's going to be all right. He'll top out 94 (mph) and sit 88 to 91. His arm is free and easy and it works well. With his ability, he's a high-ceiling guy."
Both Hatley and Morel were signed by Cubs area scout Denny Henderson in southern California.