The deputy leader of Bradford council is the favourite to replace MP Marsha Singh.
This morning Singh announced that he was to stand down as the representative for Bradford West due to ill health – and sources who know the seat well suggest that Imran Hussain is tipped to be Labour's by-election candidate.
The by-election is likely to take place at the "end of March, early April" according to a Labour spokesperson.
The party is pressing for the by-election to happen "quickly", they added.
One MP suggested that Singh took steps to ensure that "there was someone in place to replace him pretty quickly".
They said that councillor Hussain is a "good guy, but the seat will be competitive... My understanding is that he's the favourite".
Singh said that he was advised to stand down from his seat after seeking medical advice.
Labour leader Ed Miliband paid tribute to Singh this morning: "He is a man who entered politics for all the right reasons – to make a positive difference to people's lives."
UPDATE: The Bradford West by-election has been confirmed for 29 March.