Tottenham Hotspur will be looking to bounce back from the defeat to Borussia Dortmund with a win against Aston Villa.
Pierre-Emerick Aubameyang put the German side in the lead on the half-hour mark, and Marco Reus scored a brace after the break.
Onomah, who is only 18 years of age, started the game and played for the entire 90 minutes.
The teenager has admitted that Dortmund were the better team, while Tottenham central defender Toby Alderweireld has turned his focus towards the game against Aston Villa this weekend.
.@AlderweireldTob: "For now we have to focus on an important game at Villa on Sunday and then we'll think about the return leg."— Tottenham Hotspur (@SpursOfficial) March 10, 2016
The 3-0 defeat will come as a massive disappointing for Tottenham, but they do have the chance to bounce back in style.
Spurs will take on Aston Villa away from home at Villa Park in the Premier League on Sunday evening.
With Villa rock bottom, anything other than a comfortable win for Tottenham would be a massive surprise.