Hull head coach Marco Silva revealed he did not want Jake Livermore to leave the club following the midfielder's departure to Premier League rivals West Brom.
Livermore, 27, completed his permanent move to West Brom on Friday morning after Hull accepted a second bid, understood to be around £10million.
Hull are expected to announce the loan signing of defender Omar Elabdellaoui on Friday - Silva's former club Olympiacos have confirmed the deal - but the Portuguese said he must now move quickly to find a replacement midfielder for Livermore.
"If you asked me if I wanted to lose Jake, my answer is no," Silva told a press conference before Saturday's game at Premier League leaders Chelsea.
"Of course he was a very important player for us and it's never good when you lose an important player.
"But it was a very good proposal for him and the club have a good proposal also. The deal is closed. This is football.
"What we need in this moment is to find a quick replacement for this player because we've lost an important one."
When asked if he will be handed the money from Livermore's sale to strengthen his squad, Silva said: "Yes, it's important because we have a budget and you know it's not a big budget to find the best solutions."
Elabdellaoui is expected to spend the rest of the season with the Tigers. The 25-year-old right-back, a Norway international, spent last season at Greek champions Olympiacos under Silva before the latter left the club.
Silva has now drafted in three new players since replacing Mike Phelan earlier this month, with on-loan Everton striker Oumar Niasse and midfielder Evandro, for whom Hull paid an undisclosed fee to Porto, both making their debuts off the bench last week against Bournemouth.
Meanwhile, Silva is hopeful of keeping hold of winger Robert Snodgrass at least until the end of the season.
The Tigers have turned down multiple bids from West Ham and another from Burnley, reported to be £7.5million, for the Scotland international.
Tigers fans are braced for further offers for star player Snodgrass, who is doubtful for Saturday's trip to Stamford Bridge due to a muscle strain.
"I don't have news about Snodgrass," Silva said. "He didn't train with us for the last couple of days because he's had problems with a muscle.
"We'll see if it's possible or not that he'll play in the next game. But about transfers, nothing."
Silva said he was working hard to bring other players in during the current transfer window, but admitted that was proving a difficult task.
"I have the solutions in my mind, but sometimes it's not easy to make the deals," he added.
"When it became possible that Jake would leave we tried to find solutions. I have them in my mind but when a coach wants a player, it's not easy for the player to come."
Silva has no other new injury or suspension problems, while midfielder David Meyler could be available after returning to full training this week.