"...two executives from clubs that have called the Mariners about Lee say that the team is indeed willing to trade the pitcher immediately for the right offer."
Lee is 6-3 with a 2.39 ERA with 76 strike outs to just 4 walks. He would help any team in the heat of a playoff spot, which is why teams like the Rangers, Dodgers, and Twins are most actively pursuing him.
"That 19-to-1 strikeout-to-walk ratio – he’s pitching at historic levels. In the ninth inning, he’s throwing 94 mph when he has to. Late in the game when he throws a breaking ball with two strikes, he just snaps it off the table.
The team that trades for him does not necessarily need to guarantee him an extension when they trade for him. He will certainly net two draft picks when he becomes a Type-A free agent, so the team that acquires him could use him just as a second half rental.