Spezia 1-1 Inter Milan
Serie A leaders Inter Milan dropped points for the second successive game after being held to a 1-1 draw by Spezia.
Antonio Conte's charges were eager to get back to winning ways, but they fell behind in 12th minute through Diego Farias' strike.
It took a while for the visitors to get going, but they got the equaliser on 39 minutes thanks to Perisic's third goal of the season.
The league leaders were unable to find a second goal in the second stanza as they were forced to settle for a draw, leaving the side 10 points ahead of second-place AC Milan.
Juventus 3-1 Parma
Atalanta climbed to third spot in the Serie A standings with a 3-1 win over Parma.
Cristiano Ronaldo returned to the line-up after missing the 1-0 loss to Atalanta, with Alvaro Morata missing from the matchday squad.
It was the visitors who got off to the good start after Gaston Brugman opened the scoring with his first league goal of the season on 25 minutes.
Andrea Pirlo's men were back on level terms in the 43rd minute thanks to Alex Sandro's finish, before the full-back put the hosts ahead shortly after the break.
Matthijs de Ligt extended Juve's lead in the 68th minute after nodding home a corner from Juan Cuadrado.