[2] On August 1, 2022, Valdez and Wilyer Abreu were traded to the Boston Red Sox in exchange for Christian Vázquez.

[2] On November 10, 2022, the Red Sox added Valdez to their 40-man roster to protect him from the Rule 5 draft.

[7] On April 19, 2023, Valdez was promoted to the major leagues for the first time after Yu Chang was placed on the paternity list.

[8] Valdez made his MLB debut that evening, against the Minnesota Twins, and recorded two hits.

[9] He was optioned back to Worcester the next day,[10] then recalled on April 25 when Chang went on the injured list due to a hand injury.