Tom Brady and Antonio Brown spent part of Monday together, taking the initial steps toward building more on-field chemistry.

Brown spent his first day with the Patriots on Monday, with the club officially announcing the signing of the wide receiver in the late afternoon.

His contract includes an option year in 2020 at $20 million that becomes guaranteed if executed, a source told ESPN’s Adam Schefter.

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It was done to help for salary-cap-proration purposes this season.

Brown posted a picture on Snapchat that indicated he arrived at Gillette Stadium at 6:58 a.m. ET on Monday — just hours after New England beat his former team, the Pittsburgh Steelers, in its season opener.

He also knows he has an open invitation to stay with Brady.

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