PARIS — Center-left MEP Raphaël Glucksmann will announce that he’s running in next year’s presidential election in France in the next few days, most likely with a prime-time TV interview on Sunday, according to three people close to him.

The trio, granted anonymity to speak candidly about Glucksmann’s plans, said he plans to take part in a closed primary being organized by the Socialist Party that currently includes Ségolène Royal, the Socialist presidential candidate in 2007 who lost to Nicolas Sarkozy, and MP Philippe Brun. Socialist Party leader Olivier Faure has also said he is considering running.

While a win would guarantee Glucksmann the support of the Socialists, the main center-left force in France, the party has been struggling to make inroads with voters and is beset by infighting.