"We anticipate getting that paperwork done sometime soon," Mayhew told MLive.com.
The one-year option will cost the team a bit more than $8 million.
Reiff has started every game but one over the last three seasons.
Reiff has started 32 games at left tackle over the last two seasons. The Lions aren't sure that last year's right tackle
Reiff told the Daily Republic he doesn't care where he plays.
"I like playing, and wherever they want to put me, that's fine. I'll play," he said.
"I'm not going to get into that right now," Mayhew said. "I haven't made a final determination on how that process is going to go."
Reiff was drafted in 2012 and will become a free agent after the 2015 season if the option is not utilized by May 3.
Also listed as probable were
Reiff missed his first career game on Thanksgiving. Warford has missed three straight games.
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