Tejada said the agreement is subject to a physical, which will be done before the start of his first working session in Jupiter.
"I'm in great shape, I've been training every day for months," Tejada said from his home in Fort Lauderdale, Florida. "I feel that I can still help a team. I will work hard to achieve game shape, and then to earn a promotion to the big club."
Tejada, who turns 40 in two weeks, is in the midst of serving a 105-game suspension that Major League Baseball imposed on him last season. Tejada was suspended after testing positive for an amphetamine in violation of MLB's drug program.
Tejada had previously tested positive under the league's amphetamine policy, so he was subject to a 25-game ban for a second test and an 80-game suspension for a third, both of which occurred while playing for the Kansas City Royals last season.
A source with knowledge of the case told ESPNDeportes.com that Tejada will be able to return to the major leagues after May 31.
Tejada hit .288 with three homers and 20 RBIs in 53 games and was on the Royals' disabled list when he was suspended for the final 41 games of the season. The punishment included the first 64 games of the 2014 season.
Tejada, a six-time All-Star, hit .285 with 306 homers and 1,302 RBIs during a 16-year MLB career, that includes an American League MVP trophy won with the Oakland Athletics in 2002.