Middlesbrough manager Chris Wilder says the loan signing of Fulham striker Rodrigo Muniz and "maybe a couple of others" will "shake up" his squad.
Wilder said "some players should be looking over their shoulders".
"Players maybe think they're comfortable, because that's what it looked like," he told BBC Radio Tees.
"I detest that. Him [Muniz, who was in the stands watching] and maybe a couple of others will shake the group up and maybe put a few players on the back foot."
Muniz watched the game from the stands and is expected to join Boro in the next couple days.