By Tom Victor Robert Lewandowski showed why he isn’t ready to leave Europe just yet, scoring a timely hat-trick in Barcelona’s La Liga victory over Valencia on Monday night. Lewandowski, 35, had gone four games without scoring for the Catalan side, including blanks in both legs of the Champions League exit against Paris Saint-Germain. However his treble helped Barca avoid embarrassment at home to Valencia after the visitors saw goalkeeper Giorgi Mamardashvili sent off. Former Bayern Munich star Lewandowski is under contract in Catalunya until 2026, but his recent woes had seen reports surface …