Middlesbrough could be back on the trail of Swedish defender Victor Lindelof after scouts reportedly watched Benfica's match on Sunday.
Boro were one of several clubs represented at the Stadium of Light in Lisbon as Benfica brushed aside mid-table Feirense 4-0.
Lindelof had a relatively quiet afternoon at the back for the Portuguese champions.
Boro believed they had a deal in place to bring the 22-year-old centre-back to Teesside in the January window.
In a week of wrangling, they unravelled a red tape issue with the player's agent and had agreed a move in principle with the Swedish international and Benfica chiefs.
A deal had been agreed that comprised of a loan move until the end of the season with an option for a permanent deal in the summer at a cut-price fee in the region of £3m plus various add ons.
But Benfica twice moved the goalposts as the transfer deadline loomed then an injury to Lisandro Lopez catapulted Lindelof into the first team and the deal couldn't be resurrected.
However, if Boro do want to sign Lindelof again they will have to fork out up to £20million to get him after his performances in the past eight months brought Manchester United, Bayern Munich and Paris Saint-Germain to the table.