Marcos deal could leave Seaman out in the cold
Marcos, who has passed a medical, is finalising personal terms on a proposed four-and-a-half-year contract after his club Palmeiras agreed a transfer fee estimated at £2.4 million.
Arsenal want the 29-year-old to join them as soon as possible given that the transfer window closes at the end of the month and they need experienced back-up for Seaman as Rami Shaaban has a broken leg.