Liverpool have agreed a fee with Roma for goalkeeper Alisson.
The Reds made their move on Tuesday for the Brazil international and are understood to have now had a £67million bid accepted by the Italian club.
Alisson is now free to discuss personal terms and undergo a medical at Anfield.
Karius produced a disastrous performance in the Champions League final and has looked shaky on his return to action in pre-season games.
The Reds have acted fast to close out a deal for Alisson amid fears Chelsea could enter the bidding as they eye potential replacements for Thibaut Courtois, who is wanted by Real Madrid.
Should the deal for the 25-year-old go through, it will be a world record fee paid for a goalkeeper, surpassing the 53m euros (£46m) paid by Juventus to Parma for Gianluigi Buffon in 2001.