Seattle and the Los Angeles Angels, eager to sign the Japanese star, both obtained $1 million in global bonus pool cap space from the Twins on Wednesday and parted with players taken in the June draft.
Ohtani, the 23-year-old two-way star, is not believed to put a high priority on finances as he makes his decision, which must come by December 22.
Banuelos was probably the Mariners' top catching prospect in their minor league system, certainly from a defensive standpoint.
The Mariners are one of seven teams who met with Ohtani and his agents in Los Angeles earlier this week, and they're awaiting word on what comes next with the 23-year-old two-way standout.
For the Twins, they were informed on Sunday that they were not a finalist for Ohtani's services, so they chose to cash in a large chunk of their remaining bonus slot money - Minnesota had $3.245 million to spend, per the Associated Press - they had earmarked for Ohtani to acquire a pair of prospects.
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A couple of American League West teams made moves Wednesday to acquire worldwide slot money while the baseball world waits to see where free agent Shohei Ohtani signs.
Pearson is a 19-year-old left-handed hitting outfielder that was snagged by Los Angeles in the third round out of West Monroe, La.
Pearson, rated the Angels' No. 5 prospect by MLB.com, went nine picks after fellow LSU signee Blayne Enlow, a promising high school right-hander the Twins signed for $2 million.
Ohtani has until 11:59 p.m. ET on December 22 to sign with a major league team. The Cubs, Dodgers, Giants and Padres are capped at $300,000. Because he's under age 25, he can only sign a minor league rookie contract, meaning he will make the league minimum for the first three seasons before becoming arbitration eligible.
Mariners sent catching prospect David Banuelos to the Twins for $1 million in global bonus pool money.