Frei apologized to the Denver Post and Sato in his statement.
The tweet was first reported by the New York Post.
The Post's CEO, Mac Tully, and Editor-in-Chief Lee Ann Colacioppo, released a statement on behalf of the newspaper on Monday.
"SPECIFICALLY personal, i am very uncomfortable w your racism, xenophobia & lack of understanding of what the Indianapolis 500 is all about", tweeted Megan Brown. "We hope you will accept our profound apologies".More news: All charges dropped against Pittsburgh catfish tosser
Fernando Alonso hogged the spotlight all month at the Brickyard but on Sunday Takuma Sato was the headliner as the first Japanese to win the "Greatest Spectacle in Racing". "It's a shame because I felt we deserved to finish and experience the last lap - who knows where we could have finished".
The Denver Post apologized as well, saying on Twitter that Frei's words do "not reflect the standards and values of our organization".
He had originally mentioned the title of one of his books, then quickly deleted it and posted a revised version sans his book title.
Sato sped to victory at the Indianapolis Motor Speedway on Sunday ahead of Brazil's Helio Castroneves, with Team Penske, who came within a whisker of his fourth Indy 500 win, and newcomer Ed Jones, with Dale Coyne Racing, a Briton born in Dubai, reports Efe.More news: Pittsburgh Penguins Vs. Nashville Predators Game 2
The race was won by former Formula 1 driver Takuma Sato. Alonso skipped the Monaco Grand Prix to contest in the American race and led for a total of 27 laps before his Andretti Autosport Honda race vehicle gave up with just 21 laps to go, while he was in the seventh place. Sato took the lead from Castroneves for good on Lap 195 of the 200-lap race.
Sato, 40, is the first Japanese racer to win the Indy 500.
Takuma Sato, left, of Japan, toasts with vehicle owner Michael Andretti as they celebrate after winning the Indianapolis 500 auto race at Indianapolis Motor Speedway, Sunday, May 28, 2017, in Indianapolis.
That includes after Jay Howard hits the wall on lap 53, collects pole-sitter Dixon and sends him flying through the air.More news: Trump Expected to Withdraw US From Paris Climate Agreement
His vehicle went slightly under Dixon's left side, causing Dixon's auto to be lifted up and start flipping into the air.
- Zabaleta mulls options after farewell game for Manchester City
- Jason Chaffetz will resign from Congress in June
- Stopping LeBron James the focal point for Golden State Warriors
- China factory activity held steady in May, index shows
- Hamilton upbeat over Monaco GP recovery to seventh
- Pakistan's Attorney General to represent Kulbhushan Jadhav case at ICJ
- Saudi Aramco JV to develop giant maritime yard
- Americans Want The Senate To Rewrite The AHCA
- Trump administration kickstarts Nafta renegotiation
- Police union protests discipline of officers