The 20-year-old scored his third goal of the season to rescue a point for the Whites in Tuesday's 1-1 draw with Preston.
It was Nketiah's 11th substitute appearance, having not been started once by Marcelo Bielsa.
And Gunners legend Ian Wright, who has given Nketiah advice this season, has demanded Bielsa change his starting line-up.
Wright wrote simply on Twitter: "Start him."
Both Leeds and Arsenal supporters echoed the statement across social media.