San Francisco 49ers RB Frank Gore (21) is tackled by his jersey in the second half against the New Orleans Saints at Candlestick Park in San Francisco on September 20, 2010. The Saints defeated the 49ers 25-22 on a last second field goal. UPI/Terry Schmitt

ESPN’s Adam Schefter tweets that negotiations between Frank Gore and the 49ers are “going slowly” and that the star running back is frustrated. While Schefter’s report doesn’t mention anything about a trade demand, that seems like the next likely step if Gore’s frustrations continue to grow.

The Niners are in a tough spot here. Obviously they want to keep the 28-year-old back, but the Panthers overpaid DeAngelo Williams and they don’t want to do the same with Gore. San Fran lured its RB back to training camp with the promise to look at his contract, but it’s doubtful that Gore will receive anywhere near what Williams got from Carolina (i.e. $21 million guaranteed).

Although he’s younger and has been more productive, the situation could get worse if the Titans ever pony up and pay Chris Johnson. Once Gore’s camp sees all of those dollar signs being thrown at running backs, they’re going to make a case that their guy should be paid as well.

Of course, Johnson and the Titans appear nowhere closer to agreeing to a new contract than at the start of training camp. Johnson reportedly left Nashville on Sunday without meeting with Titans management and thus, the stalemate continues in Tennessee. With Larry Fitzgerald landing $50 million guaranteed, I don’t know what the Titans are waiting for.