Chelsea's failed pursuit of Mehdi Benatia was one of the transfer stories which dominated the summer window.
The Blues' interest in the Roma defender, who has since signed for Bayern Munich, was widely reported but Jose Mourinho's side failed to complete a deal.
Although Chelsea have one of the best defences in the league, there is a feeling that Mourinho could have been persuaded to bring in another top-class centre-back and Benatia was at the top of his list.
Chelsea have played with a much more technically demanding style of football this season, as they look to get their best out of the creative qualities in their squad and Benatia highlighted why he would have slotted into this style once again last night.
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While Gary Cahill and John Terry form a robust partnership at the back for Chelsea, they are not the most comfortable in possession and Benatia's superiority over the former Bolton man was particularly evident in this department on Tuesday night.
Cahill put in a credible performance against Sporting Lisbon in his side's 1-0 win, but it was clearly less classy than the one that the Moroccan put in for Bayern in their victory over CSKA Moscow by the same scoreline.
Whilst the England international struggled to find a teammate, with just 17 passes finding their intended target, Benatia found another member of his side on 111 occasions.
Cahill made 10 clearances during the match, but Benatia's greater composure so him put in a more eye-catching display.
Defensively there was little between the pair, either, with them both making one block apiece and winning a similar number of headers.
It was evidence of why Mourinho considered Benatia an upgrade at Stamford Bridge and, although the club had a great summer transfer window, this may be one target that the Portuguese boss regrets not being able to secure.