Liverpool are moving fast in the transfer market to secure some big targets before pre-season starts.

The Reds are aiming to build on their Premier League title win last season with upgrades planned in a variety of key positions.

After watching Andy Robertson struggle a touch last season, it has been clear that Liverpool needed to prioritise a new left-back.

Happily, the Reds look set to bring their top target through the door, after a deal was agreed to sign Milos Kerkez from Bournemouth.

Liverpool pick out next transfer after Florian Wirtz and Milos Kerkez as £34m deal advanced	Milos Kerkez already seen at Liverpool training ground ahead of medical as transfer agreed	Liverpool agree deal for Milos Kerkez ahead of Florian Wirtz announcement

Kerkez looks set to arrive next week, with Liverpool reportedly set to pay around £40m for the Hungarian.

However, while the arrival of Kerkez along with Florian Wirtz and Jeremie Frimpong has got fans excited, Liverpool have some work to do before they can register all three for next season.

Photo by Robin Jones – AFC Bournemouth/AFC Bournemouth via Getty Images

Although transfer windows can sometimes feel like a computer game, clubs do have rules that they need to stick to.

Most famously, the Profit & Sustainability regulations have caught a number of teams out in recent years, but Premier League clubs must also adhere to strict limits on non-homegrown players.

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Teams are currently allowed to register 17 non-homegrown players, which includes anyone who did not come through at Liverpool or a different English academy.

After the signing of Wirtz on Friday, statistician Michael Reid reports that Liverpool now have 18 non-homegrown players on the books.

READ MORE: Liverpool have three academy centre-backs who could follow Jarell Quansah’s footsteps into the first team

With Kerkez likely to make that 19 by next week, Liverpool will have to unregister, or sell, at least two players to make sure everyone can fit in.

Elsewhere, Richard Hughes has some work to do to make sure the Reds do not get themselves into a pickle here.

Clearly, Liverpool would make sure they prioritise new signings being registered if they are over the limit.

However, there is not much wiggle room in the list provided by Reid.

One glaring inclusion is Calvin Ramsay, who is unlikely to make the final list after a torrid three years with the club.

Other players who could potentially make room are Robertson, Kostas Tsimikas, Luis Diaz, Darwin Nunez and Federico Chiesa.

With at least three of those players likely to leave, along with Ramsay, Liverpool will once again be able to sign some overseas players to add to the squad.

However, after getting three signings in early, this may be one of the reasons we see the Reds focus on sales over the coming weeks.