A Sounders spokesman said there would be "no club response at this time." ESPN attributed its report to "multiple sources," and one solid News Tribune source has indicated the same.
Martins, 29, joined the club in 2013 after more than a decade in the top leagues of Italy, England, Germany, Russia and Spain.
In his first Major League Soccer season, he recorded eight goals and four assists. This season, he leads Seattle with 17 goals, a club record, and 12 assists. He is considered among the top contenders for MLS player of the year.
According to the MLS Players Union, Martins makes a salary of $1,620,000 and $1,753,333.33 in total compensation.
That already makes him Seattle’s second-highest paid player behind Clint Dempsey, who makes $4,913,004 in salary and $6,695,188.75 in total compensation.