Barcelona face Villarreal at the Camp Nou on Sunday. Villarreal are showing some signs of improvement, as they beat Real Betis last time around. Barcelona had a good game against Dutch giants PSV, grabbing a crucial win and confirming top spot in Champions League Group B. With just three points separating first and fourth in La Liga, a win for the defending champions might be enough to return to the summit. Here are three things Barcelona should do to win against Villarreal and hopefully return to pole position in the league.