MANKATO, Minn. _ Sources said Saturday the Vikings were close to finalizing a lucrative contract extension for cornerback Xavier Rhodes.

One source anticipates the extension to be in the range of $70 million over five years. Such a deal would put Rhodes under contract through the 2022 season.

Rhodes is under contract for $8.026 million for 2017.

The Vikings last Wednesday signed defensive end Everson Griffen to a four-year, $57.9 million extension. Sources said the Vikings want to lock up key members of their defense for the long term, and are also talking about extensions for defensive tackle Linval Joseph and linebacker Anthony Barr. And they have interest in extending linebacker Eric Kendricks when he is eligible for that to happen after the season.

Rhodes made the Pro Bowl last season for the first time. An average salary of $14 million per season would rank him around third among highest-paid NFL cornerbacks.

Trumaine Johnson of the Los Angeles Rams, who signed the franchise tag for $16.7 million for 2017, has the highest average cornerback salary in the NFL. The second-highest average of $15 million belongs to Washington’s Josh Norman, who has the biggest total money deal in the NFL, having signed a five-year, $75 million contract in 2016.

After that, the average salary for Arizona cornerback Patrick Peterson is $14.01 million and it’s $14 million per year for Seattle’s Richard Sherman.

Terrell Buckley, a former NFL cornerback and the mentor for Rhodes said last Tuesday there was a “high probability’’ of Rhodes signing a lucrative contract extension by the end of the week.

Buckley, who was an assistant coach when Rhodes played at Florida State, had a lengthy discussion with Rhodes last Monday.

“He is trying to get a couple of things squared away (with the contract),’’ Buckley, who played in the NFL from 1992-2005 and is now defensive backs coach at Mississippi State, said Tuesday. “He wants to be there. He loves the (Vikings) organization, but obviously it’s a business.