Despite his well-taken goal in the weekend's Premier League success over Brighton & Hove Albion, Trossard started on the bench on Tuesday night, as Bukayo Saka and Gabriel Martinelli began alongside Kai Havertz in attack.
Mikel Arteta's selection initially paid dividends, as Saka broke the deadlock early doors with a well-taken curler into the bottom corner, but the Gunners were then made to pay for a couple of individual errors.
Ex-Arsenal winger Serge Gnabry and Harry Kane both returned to North London to haunt the Premier League leaders, the former finishing low underneath David Raya before Kane coolly dispatched a penalty after William Saliba clipped Leroy Sane.
However, a pair of inspired substitutions from Arteta saved the day for Arsenal, as Gabriel Jesus produced some nifty footwork in the box before laying off the arriving Trossard to sweep home the leveller.
Trossard one of four men to achieve impressive featEnhancing his reputation as a super substitute, Trossard has now scored in each of his first four Champions League home games for Arsenal, having also made the net bulge against Porto, PSV Eindhoven and Sevilla.
In doing so, the Belgium international became just the fourth man to net in each of his opening four Champions League games on familiar territory, joining esteemed company in Alessandro Del Piero, Frederic Kanoute and Oscar.
Del Piero was the first to achieve the four-game feat during the 1995-96 season, where he netted in home clashes with Steaua Bucharest, Rangers, Borussia Dortmund and Real Madrid while playing for
Read on sportsmole.co.uk