ESPN pundit and former Liverpool defender Steve Nicol has fired a warning to Arsenal forward Kai Havertz amid a summer transfer rumour. Kai Havertz impressed when tasked with leading the line for Arsenal last season. Having joined the North London club last summer, Mikel Arteta initially planned to reinvent the German as a midfielder. However, the former Chelsea man struggled to produce his best form for the Gunners in this unfamiliar role, and looked short on confidence. Around the mid-point of the campaign, Arteta pushed Havertz further up the pitch, and he hit a purple patch whilst leading …