The visitors were 3-0 ahead at halftime and were flat for the second-half.
“We need to be more organised than we have been in recent games, otherwise we lose balance, so today I asked the players to not lose their positions," Sarri said afterwards.
“At times, the team can get a bit too instinctive and lose their shape.
“We passed the ball with quality in the first half and it could've torn any opponent apart. Samp are a good squad, so this result should not be underestimated."
Sergej Milinkovic-Savic was sent off for dissent.
Sarri added: “I can tell you exactly what he said to the referee: 'You didn't see a ****ing thing.' For an experienced referee like this, the discussion could've been sorted out without needing to resort to cards.
“Milinkovic-Savic was naïve, but Fabbri was also a bit hasty."
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!