Since Thomas Tuchel took over as manager, Chelsea have conceded just two goals in 13 games under his new five at the back system.
But changes are imminent and the manager has reportedly put together an exciting three man transfer shortlist.
According to The Athletic, Tuchel has already identified three world-class centre-halves he wants to bring in this summer.
One of those is sextuple winner with Bayern Munich, Niklas Sule, who faces stiff competition for places at the Allianz Arena.
RB Leipzig and France U21 international Ibrahima Konate is also on the list, with injuries and a lack of chances leaving him on the fringes of Julian Nagelsmann’s plans.
Finally, Atletico Madrid stalwart Jose Gimenez would be a more experienced option, with seven seasons of regular La Liga action under his belt.