OM and Arsenal have been in negotiations for several weeks over the France U21 captain, who spent last season on-loan with Hertha Berlin.
OM had an offer of €10m rejected by Arsenal, which rate Guendouzi closer to €20m.
Le 10 Sport says a breakthrough has been found by OM over the last 24 hours, with a compromise over a price getting closer.
Interestingly, it's also suggested Arsenal have a unilateral option to extend Guendouzi's 12 months to 2023 this summer.
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