"I waited for my passport and the embassy didn't send it to me for 10 days," Mijares said after Sunday's workout.
Manager Ned Yost didn't anticipate that it'd take Mijares long to make up for lost time.
"He threw deep into the winter, where the majority of our pitchers were doing their conditioning and stretch work, he was pitching," Yost said. "He's a bit behind, but he'll be able to catch up real easy."
Signed as a free agent from Minnesota, Mijares pitched in 20 games in the Venezuelan Winter League and had a 4-0 record and 2.80 ERA for Tigres de Aragua. He's projected as a situational lefty, used primarily to face left-handed batters.
Mijares said he'd been working out at home for the last two weeks and felt good during Sunday's practice in which he threw in bullpen.
"We'll have him ready to throw two innings by the end of Spring Training," Yost said. "Will he ever throw two innings? I don't know but at least he's prepared and ready."
Yost said there would be no fine or discipline because, although the Royals' reporting date for pitchers was Feb. 20, the Major League date for players is March 2.
"The last time I checked we were still in February," Yost said. "He had a legitimate reason and there wasn't even a fine or punishment considered or thought about."