Jurrien Timber had opened the scoring for the hosts five minutes before the introduction of Yoro, who was tasked with helping Amorim's side find a route back into the contest against the title-chasing Gunners.
Despite the home team extending their advantage through Leny's compatriot William Saliba, and going on to secure the win, our young defender was able to make several notable interventions as he builds his match sharpness back up.
His ball-winning tackle on Leandro Trossard, as the Belgian was bearing down on goal, was well received by our travelling supporters at the opposite end of the stadium, minutes before the 19-year-old's last-ditch clearance stopped Trossard getting on the end of a centre from Bukayo Saka, even if the offside flag did go up straight after the ball went out of play.
It is obviously not the result Leny would have liked on his Premier League bow, but his return is a rewarding sight after a difficult start to his Reds career and a definite positive for Amorim's men, early into what is a busy December schedule.