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01/05/10 4:59 PM EST

Gutierrez, Seattle on verge of extension

Center fielder's deal reportedly for four years with an option

The Mariners reportedly are on the verge of signing center fielder Franklin Gutierrez to a four-year contract extension for $20.5 million with a team option for a fifth year, Gutierrez's agent Wil Polidor told MLB.com.

"We are really close. We want to get it done this week," Polidor said. "Maybe today or tomorrow or in a few hours. We are just waiting on Seattle. It's 90 percent done."

The pending deal with Gutierrez was first reported on Tuesday via twitter from Francisco Blavia in Venezuela.

Regarding the Gutierrez report and Seattle also nearing a deal for Boston's Casey Kotchman, a Mariners official said, "We don't comment on players from other organizations or any contract discussions with our own players."

"Frankie is really happy," Polidor said. "He wants to be in Seattle, and he really likes the organization. It's going to something good for Seattle and something good for Frankie. Everybody is happy and excited. We worked hard on this."

Gutierrez, acquired from the Indians on Dec. 10, 2008, in a three-team, 12-player trade that also involved the Mets, provided the Mariners with Gold Glove-caliber defense in 2009 during a breakout season.

He finished the season with a .283 batting average, 18 home runs and 70 RBIs in 153 games. The right-handed batter hit .335 (55-for-164) against left-handed pitchers, the 10th-highest in the American League.

Jim Street is a reporter for MLB.com. Jesse Sanchez contributed to this report. This story was not subject to the approval of Major League Baseball or its clubs.