The homegrown youngster started against Monaco in midweek.
Mauricio Pochettino has trusted in the club’s young players since taking over at White Hart Lane, with a host of youth academy graduates key to the Argentine’s thoughts.
The North London side have had a progressive season so far as a result, with the young side starting to take hold of the South American’s footballing philosophies and ideals.
Onomah is another player to come through the Spurs ranks and has been on the fringes of the first-team this season.
The 18-year-old got a chance to start for the Lilywhites in their 4-1 thrashing of Monaco in the Europa League and did not look out of place in the home side’s attack.
Alderweireld has stated that playing alongside Onomah in training every day shows that the teenager is ready for regular action in the Premier League.
“We train with him every day - he is quick, strong, an exciting footballer with a good future,” The Mirror quote the defender as saying.
“It was a good opportunity for him to show his quality.”
Onomah has a host of experienced international players to compete with for a place in Pochettino’s midfield, but looks ready to be introduced to the first-team fold as Spurs look for a top-four finish this term.