Abramovich joined Revolution owner Robert Kraft to watch the game at Gillette Stadium in Foxborough, Mass., Both men donating $ 1 million to the charity fund.
In an interview with CNN on Wednesday, Kraft revealed how the Pittsburgh attack had been the catalyst for Wednesday's match with both men deciding that action was needed in the fight against anti-Semitism.
"We discussed mutual interests and the use of sport to build bridges and what happened in the field of anti-Semitism was very troubling for both of us," he said. Kraft told CNN on Wednesday.
"When we saw this event taking place in Pittsburgh, we wanted to do something to show our respect and concern, so it was very magnanimous for him (Abramovich) to take his team here, especially when it is still competition for the Europa League here for seven hours.
"They visited schools, went to the Holocaust memorial in Boston, they were all at my house last night, the two teams were in a program, a lot of people talk about things, but Chelsea does it and supports.
"Chelsea has been a great role model and has demonstrated excellent leadership and an excellent partner, we are honored to do so, I think it has gone pretty well."
Chelsea, whose campaign "Say No to Anti-Semitism" won applause in football, arrived in Boston on Monday with the entire team at the New York Holocaust memorial. The club's foundation has also organized educational workshops in schools in the region.
The idea of the campaign was conceived in November 2017 by Abramovich himself after an informal meeting with the club's board of directors. Abramovich, who is Jewish, expressed his concern over the resurgence of anti-Semitic incidents around the world and suggested that Chelsea try to solve the problem.
Since the launch of the campaign in January 2018, Chelsea has taken supporters to Auschwitz to raise awareness of the horrors of the Holocaust, invited survivors to speak to the team and helped raise funds for a campaign. New exhibition on the Holocaust at the Imperial War Museum in London.
"The Holocaust has been an unprecedented crime in history," writes Abramovich. "We must never forget such atrocities and we must do everything in our power to prevent this from happening again, yet all over the world we are witnessing an upsurge of manifestations of anti-Semitism.
"Today's match is the next step of our campaign: to raise funds and raise public awareness of initiatives that tackle discrimination, persecution and hatred, by putting Focus on anti-Semitism.
"The two teams have come together to think that football has the power and the responsibility to tackle the world's most important problems."
Chelsea returns home
Abramovich would have appreciated what he had seen on Wednesday with a 3-0 win over Chelsea thanks to goals from Ross Barkley, Olivier Giroud and Gonzalo Higuain.
However, Ruben Loftus-Cheek was forced to leave the action early after appearing to injure his ankle.
Chelsea, who will return to London on Thursday, will play his final match of the season against Arsenal in the Europa League final on May 29 in Baku, Azerbaijan.