Most of the talk surrounding West Ham's transfer business this summer has been about the club's attacking acquisitions. 

Hammers supporters in particular, no doubt, will be dying to see Felipe Anderson and Andriy Yarmolenko put on the claret and blue shirt for the first time competitively.

West Ham, though, have also made some important signings at the back with central defenders Issa Diop and Fabian Balbuena coming in, while right-back Ryan Fredericks joined on a free transfer from Fulham last month.

Including the addition of Lukasz Fabianski in goal as well, Manuel Pellegrini's reshaping of West Ham at the back is coming along nicely.

The former Manchester City boss, however, could still probably do with a new left-back.

Considering Arthur Masuaku has developed into more of a left wing-back/left winger, Aaron Cresswell is West Ham's only real option in that position.

Furthermore, Pellegrini should consider making a move for Arsenal's Nacho Monreal, who is valued at £11.7m by Transfermarkt.

According to Goal, Monreal is one of a bunch of players new Arsenal head coach Unai Emery could boot out of the Emirates this summer, and West Ham should put themselves at the front of the queue if that happens.

Given that Pablo Zabaleta and Patrice Evra were not exactly success stories, at 32, West Ham fans may be sceptical about their club bringing in another ageing full-back.

Monreal, though, is still playing at a very high level and was one of Arsenal's standout performers last season.

Monreal has become one of the most consistent defenders in the Premier League after initially struggling to adapt to English football following his arrival from Malaga back in January 2013.

The Spain international, capable of playing at both left-back and left centre-back in a three-man defence, is usually solid when defending in 1v1 situations, while he has also turned himself into quite the threat from set pieces.

At what is likely to be for a very reasonable fee, West Ham signing Monreal would be a shrewd bit of business.