Journalist Charles Watts was not impressed by what he saw from William Saliba for Arsenal against Porto. Arsenal centre-back William Saliba was not at his best against Porto on Wednesday evening. The Gunners were beaten 1-0 in the first leg of their Champions League round of 16 clash in Portugal. However, things could certainly have been even worse for the north London club, as the hosts had their chances to score even more in the match. Arsenal have been extremely impressive defensively this season, especially in the last few weeks. They have only conceded twice in their last five Premier Lea…