The Portugal international netted a hat-trick to help his side to a 5-1 win over the Basque side and has now scored 16 goals in 2013-14.
Veteran striker Frode Johnsen, meanwhile, moved into fourth spot after scoring the winner in Odds' 3-2 victory over Honefoss to take his tally for the season to 24.
Kalju Nomme attacker Vladimir Voskoboinikov also had a weekend to remember as he hit all of his side's goals in their 3-0 win against Tammeka Tartu.
A fresh face in the top 10 is Fiorentina striker Giuseppe Rossi, who continued his fine form this term with two goals against Sampdoria to become Serie A's leading scorer with 11 goals.
Other names who had a remarkable week include Heerenveen's Icelandic striker Alfred Finnbogason following the first Eredivisie hat-trick of his career and Estonian hitman Rimo Hunt, who took his tally for 2013-14 to 22.