Mulumbu tells Congo to wait as West Brom a priority
The DR Congo midfielder first stepped down from international duty in October 2009.
And despite contemplating a return this year, Mulumbu has confirmed that club commitments are his main concern right now.
But the 23 year old has told his countrymen that his international career is not over yet - he could even add to his eight caps in the New Year.
"I have had a word with the president of the federation and, at the moment, I have told him I am focused on the Premier League season because it is my first full one," he told the club's official website.
"We are going to talk again in December and I will give him an answer.
"I stopped playing for my country at first because of disorganisation but after that we had a word and I told him that this year I need to focus on West Brom.
"We need to stay in the Premier League and it's a big season in a big league.
"There is high intensity and I need some rest because I run a lot.
"I think he understood that, which is why he said we will talk again in December when I will let him know how it is going."