 Complete the following phrase:  Boniek transferred to Italian football giants Juventus in 1982. With Juventus he won the Coppa Italia in his first season, also managing a second-place finish in the league and reaching the 1983 European Cup Final in the same season. The following season, his performances proved decisive, as Juventus won both the Serie A title and the Cup Winners Cup in 1984, with Boniek scoring the matching-winning goal in the 21 victory over Porto in the final of the latter tournament in Basel; he followed up these victories by claiming the European Super Cup later that year, scoring twice in the 20 win against Liverpool. He also won the European Cup in 