Sarkic joins from Benfica after a successful loan spell, which saw him score four times in the first part of the campaign for the under-23s.
He was Leeds' most consistent striker for the under-23s, and his experience playing for Benfica in the UEFA Youth League is paying off.
With summer signing Jay-Roy Grot struggling for first team action and disappointing when he does get a chance, Sarkic could have an opportunity to switch places with the Dutchman.
He started and scored yesterday in Leeds' 4-3 under-23 win over Hull City, and fans are keen to see more of what he can do.
Sarkic is not the experienced striker Leeds need, but he could go on to have a major impact, and anything he contributes this season is a bonus.
Here is a look at how Leeds fans reacted on Twitter to his signing being confirmed...
This guy will surely do better than Grot?!— Anthony Taylor (@TaylesyAnts) January 11, 2018
Quality— BRΔDLEY (@nixonbradley) January 11, 2018
This lad has been on loan from Benfica for us in the u23’s. Looks like a real baller, hence why we’ve made it permanent.— Matt Rellaw (@GoTkunt) January 11, 2018
Quick and direct. He's got stuff to work on, but you can absolutely tell the talent is there, always a threat.— Distractedsen Leeds (@DistractedLeeds) January 11, 2018
And immediately loans him to Cultural Leonesa— Batesy (@BatesyLufc) January 11, 2018
Seeing a lot of bellyaching about us signing Sarkic. Yes, he's not ready for the first team. Making an existing player's loan permanent doesn't mean that we're not also working to address the senior squad's weaknesses. The two aren't mutually exclusive, y'know. #lufc— David Guile (@ellandduck) January 11, 2018