Oliveira joined the Rossoneri last summer in a 10m-euro (£6.8m) deal from Spanish side Betis, but failed to make an impression at the San Siro.
The 27-year-old returns to the Primera Liga hoping to pick up where he left off at Betis - he scored 22 league goals in 37 appearances in the 2004-05 campaign, and also won the Copa del Rey, scoring the first goal in Betis´ 2-1 win over Osasuna.
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