The Spanish side announce the purchases of the two attacking players, from Getafe and Hamburg respectively, after finishing fifth in La Liga, with both signing long-term contracts
Del Moral, who arrives from Getafe, signed a four-year contract, while Trochowski, formerly of Hamburg, signed a five-year deal.
A statement on the club's official website reads: "Sevilla already have their two first signings for the next campaign, Manu del Moral and Piotr Trochowski, who have signed for the Nervionenses for four and five seasons respectively. The buy-out clauses reach €20 million [£17.4m] for Del Moral and €17m [£14.8m] for the German."
Both players are 27-years-old and bring a wealth of experience to the club. Sevilla finished the 2010-11 campaign in fifth spot.