PSG, playing their third warm-up game ahead of the new campaign, did not select new signing Zlatan Ibrahimovic, nevertheless fielded a strong attacking line-up and provided a stern test for the Blues.
The Ligue 1 runners-up had the better of the first half and took the lead in the 29th minute, Nene scoring from the rebound after Javier Pastore had wriggled between Gary Cahill and Gael Kakuta, and struck his shot against the post. Piazon's leveller came eight from time.
England defenders John Terry and Ashley Cole were introduced for the final half-hour - their first pre-season action.
The equaliser arrived in the 82nd minute, 18-year-old Piazon combining with fellow Brazilian Ramires before coolly slotting into the bottom corner.
Chelsea, who opened their United States tour with a 4-2 win over the Seattle Sounders on Wednesday night, next head to Philadelphia to prepare for Wednesday's game against the MLS All-Stars at PPL Park.
Source: PA
Source: PA