Leandro Trossard was Arsenal's "Plan B" when he arrived at the Emirates in a transfer worth up to £27 million from Brighton & Hove Albion in January. But the winger might just prove to be the most significant Premier League signing of the season and the one who delivers the key ingredient to winning the title.
Of course, if Manchester City overhaul the Gunners to claim a third successive title during the final two months of the campaign, Erling Haaland's incredible goal tally -- already at 42 in 37 games in all competitions -- will ensure that the Norway forward will be regarded as the most impactful transfer.