Chelsea scout Guy Hillion was in the stands at Monaco's Ligue 1 clash against Marseille on Sunday evening.
Hillion was taking in the performance of two Marseille players as Chelsea start to put together their summer transfer plans.
Hillion has admitted to being keen on Giannelli Imbula, and the midfielder was again on his watch list at the Stade Louis II.
He was joined by team-mate Florian Thauvin, another player the Blues are beginning to take a keen interest in.
Thauvin is also on Arsenal's radar, with Gunners boss Arsene Wenger having labelled the attacking midfielder French football's great hope.
Both Imbula and Thauvin are relative newcomers to life at Marseille.
Midfielder Imbula was snapped up by the French giants just last summer, moving from then-Ligue 2 side Guingamp.
He has made an instant impact and Hillion has been quick to spot his talent, with the Chelsea scout remarking earlier this season: "He covers well, has good technique, great vision of the game, with a very good quality pass and a great left foot."
Thauvin meanwhile also landed at Marseille last summer, having forced an exit from Lille in controversial circumstances.
Wenger is a confirmed fan, saying before Arsenal's Champions League meeting with Marseille at the end of November: "He was also followed and we were interested in him before he went to Lille.
"He is one of the great hopes of French football."
The game Hillion watched finished 2-0 to Monaco.
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