The left-back position has been problematic for Chelsea and manager Frank Lampard this season but that problem will almost certainly evaporate with just one quality signing.
Chelsea have both Marcos Alonso and Emerson Palmieri as their left-back options but the two players have shown that they are not at the required level.
Marcos Alonso is a good attacking outlet but the Spaniard is a defensive liability, while Brazilian defender Emerson Palmieri is not just good enough for the way Chelsea and Lampard want to play.
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Frank Lampard has had to make do with club skipper Cesar Azpilicueta at left-back as the Spanish international has had to move over from his customary role at right-back with young defender Reece James taking up his own position at right-back.
Leicester City left-back Ben Chilwell has been linked with a transfer to Chelsea amidst the fact that Frank Lampard is a big admirer of the England international but media referee thinks that Bayern Munich left-back David Alaba would be a better and more experienced option.
The Austrian international has nailed down his legendary status at Bayern Munich having been at the club virtually throughout his career.
He has won eight league titles, four cup titles and the 2013 Champions League title.