Diego Simeone says that while Atletico Madrid are always open to new signings, an injury to Tiago has increased their need to strengthen in January.
Club president Enrique Cerezo expects the Portuguese to be sidelined for at least three months after he sustained a broken leg in a 1-0 win over Espanyol on Saturday.
While Atletico are apparently ever-willing participants in mid-season transfer dealings, their Argentine coach admitted the blow could cause them to intensify their search for new additions to the squad.
"We are always open to any situation when the winter transfer window comes," Simeone said.
"It will not be an exception now, more so due to the absence of a player like Tiago."