Chelsea are understood to be on the brink of completing their second deal of the summer before the transfer window has even opened.
Recent reports suggest that Frank Lampard is not willing to stop there, though, with three other players on his shortlist as Chelsea look to make up for failing to sign a single player in the previous two transfer windows.
Here, Sports Mole looks at who those three players are and how much they could cost.
Once the Werner deal is done and dusted, Chelsea's main focus is expected to switch to bringing in Ben Chilwell from Leicester.
The futures of incumbent left-backs Marcos Alonso and Emerson Palmieri remain uncertain, and Chilwell has long been linked with a move to Stamford Bridge, even during such a successful season for the Foxes.
The 23-year-old came through the ranks at the King Power Stadium and has gone on to establish himself as one of the country's top full-backs, earning 11 caps for England.
Leicester are under no pressure to sell, though, and have a reputation of sticking to their asking price, which for Chilwell is thought to be around £60m.
Nathan Ake has regularly been linked with a move back to Stamford Bridge since leaving the club for Bournemouth on a permanent basis in 2017.
Now 25, the centre-back often flirted with the first team during his first spell at Chelsea, but spent most of his time out on loan and only made 17 senior appearances for the Blues.
Bournemouth have previously demanded up to £85m for Ake, although Chelsea are thought to have an option in his contract to sign him for £40m this summer.
The Dutch defender has made 115 appearances for Bournemouth in total and could push for an exit if the Cherries are relegated from the Premier League this season.
Said Benrahma has enhanced his burgeoning reputation even more in the Championship this season, scoring 10 goals and creating eight more in 34 outings.
The Brentford forward's form has seen him linked with a move to the Premier League, with Chelsea and Arsenal among the clubs thought to be interested in his signature.
The 24-year-old is reportedly valued at around £34m by the Bees, just two years after joining for around £1.5m.
Benrahma would represent a bigger risk than the other two targets, however, having not yet gained any Premier League experience.