Adam Thielen's deal with Vikings includes $4 million signing bonus

MINNEAPOLIS -- Adam Thielen's contract extension with the Minnesota Vikings, which became official once the wide receiver signed it on Tuesday, keeps Thielen with the team through the 2020 season at a price that should still be manageable for the team.

Thielen's new deal is effectively a four-year contract that converts his $2.746 million restricted free agent tender into his base salary for 2017. He also received a $4 million signing bonus as part of his total guarantee of $10 million, according to NFLPA salary data, and will be eligible to earn per-game roster bonuses of up to $100,000 in 2018, 2019 and 2020. A league source told ESPN last week that Thielen's contract includes incentives that could help it reach a total value of $27 million.

His deal costs the Vikings $3.746 million in cap space this season, with cap numbers of $4 million, $5 million and $6.5 million in 2018, 2019 and 2020, respectively. The deal makes Thielen -- a Detroit Lakes, Minnesota, native who played at Division II Minnesota State-Mankato -- the team's highest-paid receiver, though the Vikings are likely only a year away from working on a new contract for Stefon Diggs.

With Thielen's deal on the books, the Vikings have $16.99 million in available cap space.