Now they have to figure out what to do with 10,000 T-shirts.
The Athletics had planned a promotional giveaway for their home game against the Kansas City Royals on Saturday, when the first 10,000 fans would receive a Cespedes-themed T-shirt with the message "La Potencia" -- Spanish for "The Power" -- written across the front.
Hours after completing the blockbuster trade, the A's announced on their official Twitter account that they still planned on giving away the T-shirts before Saturday's game.
Oakland also announced an additional promotion for Aug. 7, when the team will give away Josh Donaldson T-shirts to the first 15,000 fans in attendance.
- Oakland Athletics (@Athletics) July 31, 2014
Cespedes provided plenty of "potencia" in his two-plus seasons with Oakland, belting 66 home runs. The All-Star outfielder had 17 homers and 67 RBIs in 101 games this season.
ESPN's Darren Rovell contributed to this report.