Liverpool captain, Virgil van Dijk, has taken responsibility for Gabriel Martinelli’s goal in their 3-1 defeat to Arsenal on Sunday. Bukayo Saka had made it 1-0, before a clumsy own goal from Gabriel Magalhaes levelled the game. But early in the second half, Van Dijk clashed into goalkeeper Allisson Becker, leaving Martinelli to roll the ball into an empty net. Leandro Trossard then came off the bench to seal a huge victory for the Gunners. Van Dijk, speaking to Sky Sports, said: “A tough day. I think the 2-1 [Martinelli’s goal] I take full responsibility for that. “That is a big moment in the…