A Gunners icon also likened the centre-back to The Hulk and his alter ego Bruce Banner
Arsenal defender David Luiz has been compared to the protagonist of Robert Louis Stevenson's 1886 novella Jekyll and Hyde, with former club icon Emmanuel Petit insisting that it is impossible to tell what the Brazilian is liable to do next.
The centre-back was signed shortly before the transfer window slammed shut as the Gunners scrambled to bolster their back-line with some much-needed experience, an area widely regarded to be the weakest link in the north London side's armor.
Experience is something Luiz has in abundance, but any long-term spectator of the 32-year-old will be aware of his reputation as being erratic at times, and Petit made some interesting comparisons to warn Arsenal fans of individual mistakes throughout the season.