After surgery, Brown was supposed to be out three to six weeks. It's now approaching two months.
He will begin his rehab at Class A Clearwater.
"Right now he's scheduled to play three or four games at Clearwater and we'll see what happens after that," Amaro said.
How Brown now fits into the Phillies' picture once he returns is still up to question.
"We just want to get him to play. He hasn't played in a long time," Amaro said. "He's starting to swing the bat better. He started very slowly at extended [spring training]. Today, he hit two home runs and went 4-for-5 or something like that. He's progressed much faster over the last few days, so we think he's ready for Clearwater. Can have an impact on the big league team this year? We'll see how he plays."
Brown batted .210 with two homers and 13 RBIs in 35 games last season for the Phillies.
Meanwhile, Minor League second baseman Harold Garcia suffered an injury to his right knee and will be out for the season, Amaro added.
"He's scheduled to have surgery to repair his ACL on Monday, unfortunately," he said.
Amaro added that Garcia hurt the knee in a collision. A utility player, Garcia, 24, was hitting .300 with three doubles, two homers and four RBIs in 12 games for Double-A Reading.