Mikel Arteta has revealed Kai Havertz battled through illness to be Arsenal’s hero in the north London derby.Havertz scored one goal and set up another as the Gunners won at Tottenham to stay top of the Premier League.Arteta praised Havertz for the way he led the line against Spurs and explained how he overcame illness to play.“He was sensational in every department today,” Arteta said. “He wasn’t at 100 per cent.“He was ill before the match, he was a bit struggling and still he put the performance that he put in. I thought he was unbelievable today.”