Striker Obi managed an astonishing 32 goals in just 18 U18 Premier League appearances for Arsenal last season, and has scored nine in 11 for United's youth ranks this term.
RUBEN AMORIM was forced to name EIGHT teenagers on the bench for Manchester United's clash with Tottenham on Sunday.
The Danish 17-year-old has been highly rated for a long time after smashing youth records while on the books with Arsenal - and United fans have been gagging to see him lineup for the first team.
Similarly to Ayden Heaven, Obi-Martin, joined United earlier this season after the Red Devils snatched him away from the Gunners academy.
The United boss is navigating a horror injury crisis at Old Trafford that has left him with ELEVEN first team players out of action.
