West Ham fullback Ilunga delighted seeing Mulumbu thriving at West Brom
The Hammers face West Brom next Wednesday.
"He's a very good player, but he's young," Ilunga said of his DR Congo teammate to whufc.com. "This is his first year in the Premier League so I'm looking forward to seeing him on the pitch.
"He's still young and at this moment he has said he doesn't want to play for the national team as he prefers to play for his club. Maybe after, he will be back for us."