So it appears Chelsea are all set to pull off one of the most surprising deals in this summer's transfer window, never mind on deadline day itself.
David Luiz is reportedly on his way back to Stamford Bridge in a deal worth approximately £32 million.
Just two years after Paris Saint-Germain spent £50m to take the Brazilian to France he is set to become Antonio Conte's latest major addition at Chelsea.
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Meanwhile, across town, the Blues' Premier League rivals Arsenal have similarly found themselves frantically searching for a new centre-back but finally secured the signature of Shkodran Mustafi late last night.
So, therefore, it only seems right to examine Arsenal's latest £35 million signing against Luiz's performances from last season to find out who really has pulled off the better deal.
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Firstly, the key thing to point out is their contrasting game time. Luiz, competing in PSG side challenging for the title, played 2089 minutes across 25 matches while Mustafi, for a struggling Valencia team, featured in 30 games and was on the pitch for 2681 minutes in La Liga.
Despite Mustafi's more significant playing time, the sample is still big enough to compare the pair's key statistics, both defensively and offensively.
Starting with their tackles won per game, Arsenal's new man beats Luiz 1.7-0.92, according to Squawka. Mustafi clearly likes to throw himself around and won't be afraid to get stuck in.
But that isn't the only thing, Mustafi averaged better than Luiz at last term.
Aerial duels won (2.9-1.08) and clearances (5.6-3.36) also swing towards the German, however, the most glaring difference between them rests on interceptions.
Playing in a PSG team always on the front foot, you would expect Luiz's clearances to be little low, simply because the French champions' defence was rarely put under any significant pressure.
But Mustafi's 4.43 interceptions, compared to Luiz's 2.4 per game, shows the former's anticipation is much better than the Chelsea-bound Brazilian.
That will certainly be put to the test in the fastest league in the world this season but based on all of the key defensive attributes, Mustafi should have a greater impact at the Emirates than Luiz at Stamford Bridge.
Luiz's perceived effectiveness in the opposite half also turned out to be somewhat of a myth during the 2015/16 campaign.
The confident centre-half scored just one more goal (3) and one more assist (2) than Mustafi across all competitions, so if Chelsea think they are getting someone who will regularly contribute at both ends, they will be sadly mistaken.
There is no doubting Antonio Conte's boldness at bringing Luiz back to Chelsea, however just how much of a difference he will make remains to be seen.
For Arsenal, Mustafi would appear to be a very solid acquisition and his toughest test will be adapting to a new league, a factor which may hand Luiz the advantage in the short term. In the long term, though, Gunners fans may well be laughing at Wenger's last piece of business this summer.