Former Arsenal star Gilberto Silva has urged his old club to sign Premier League midfielder Douglas Luiz this summer. Silva believes it would be a great move for both parties. He, however, admitted that Luiz, who plays for Aston Villa, will be expensive because he is in form. Luiz has been in top form for Aston Villa this season, scoring 10 goals and providing 10 assists in 42 games. Speaking to Caught Offside, Silva said about the Brazil international (via Metro): “I think he will be expensive because he’s in good form. I am just happy to see another Brazilian doing a great job in the Premier…