Mpanzu, who is still hoping his team can avoid relegation in their first season in the Premier League, came off the bench in a 5-1 loss to Manchester City at the weekend.
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On the landmark, Mpanzu stated post-game: I'm proud of myself, proud of my team-mates, proud of the friends and family, proud of the club for keeping me here for so long.
It's about trying to keep fit and 400 games is a good milestone for any player for any club. So to do it here, Luton Town in the Premier League, it's a real lifetime achievement and hopefully I can get more.
These last five games, we're going to put everything into it as a team and hopefully we can get more next season."