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The present invention relates to a catalytic system made from at least one conjugated diene monomer for preformation, an organometallic compound as a co-catalyst, a metallocene of formula {P(Cp1)(Cp 2)Y}, Y designating a group comprising a metal atom which is a rare earth, Cp1 and Cp 2, identical or different, being chosen from the group consisting of the fluorenyl groups, cyclopentadienyl groups and indenyl groups, the groups being substituted or non-substituted, P being a group bridging the two Cp1 and Cp 2 groups, and comprising a silicon or carbon atom. Such a catalytic system has an improved stability of catalytic activity over time, in particular during storage.