Eto???o has been pictured on TV arriving in Rome for a medical and is expected to be presented to the Sampdoria crowd ahead of Sunday???s Serie A match at home to Palermo.
The arrival of the 33-year-old former Barcelona, Inter and Chelsea man is likely to cause great excitement in the stands but Mihajlovic says his players must not get caught up in the atmosphere.
“Party, what party?” he said, when asked about Sunday???s match. “Eto’o is joining this team but he must not be a distraction.
“He’s a great player, who has won everything, and that attracts a lot of attention from the media, but this should not distract us.
“The reason we are third is thanks to these guys, their commitment and their daily work.”
Eto???o only joined Everton in August after a season at Chelsea but he has repeatedly been linked with a move to Sampdoria of late, reportedly due to his desire for more regular first-team football.
The prolific forward has won a series of honours in a hugely successful career, including a pair of Champions League victories with Barcelona and another with Inter.
He is set to join a Sampdoria team who are enjoying a fine campaign and they are joint third in Serie A alongside Napoli.