Atletico Madrid have fuelled rumours about a return for Diego Costa, after their chief executive insisted the club will sign one more player before the window shuts.
The La Liga side are currently under a transfer embargo, meaning any players who sign won't be able to feature for six months, but that hasn't stopped them from doing deals.
They have signed Vitolo from Sevilla and loaned him out to Las Palmas, and a similar situation could arise with Chelsea striker Costa this summer.
Diego Costa's Chelsea career appears to be over, and he could leave before the window shuts
The Spain striker was seen practising on a beach recently, and he is keen to leave west London
The Spain striker left Atletico for Chelsea in 2014, but could now return after being deemed surplus to requirements by Antonio Conte.
Speaking to the Spanish club's website this week, Atletico Madrid chief executive Miguel Angel Gil Marin explained the situation.