Saracens’ Alex Lozowski ready to step in for Farrell as Leinster tie looms

• Farrell ‘touch and go’ to be fit for Challenge Cup quarter-final• ‘I’ll do whatever the team needs. We all want to play the big games’Alex Lozowski is ready to lead the Saracens backline against Leinster in the European Challenge Cup quarter‑final in Dublin on Sunday should Owen Farrell fail to recover from a leg injury.Farrell, who finished England’s Six Nations campaign at fly-half after four matches in the centre, missed Saracens’ 24-11 Premiership win against Harlequins at the Olympic Stadium and, along with the second‑row George Kruis, was rated “touch and go” for the game by the club’s…