The Portuguese forward apologised for the incident, which happened in PSG's 5-2 first-leg win at the Parc des Princes.
A UEFA investigation found Neto was guilty of unsportsmanlike conduct and added a booking to his disciplinary record.
He will be available for Tuesday's second leg at Stamford Bridge.
"We were losing and in the emotion of the game I wanted to get the ball fast and I gave him a little push," Neto told broadcaster TNT Sports after the game
"I'm not like this. It was in the heat of the moment and I want to apologise. I gave him my shirt. I'm really sorry about it - I feel I have to apologise to him."