West Ham United have already made two summer signings with goalkeeper Darren Randolph and midfielder Pedro Obiang both arriving from Birmingham City and Sampdoria respectively.
However, new manager Slaven Bilic still needs to be active in the transfer market, with one position in particular causing problems.
Right back Carl Jenkinson spent last season on loan at Upton Park, but is now back with parent club Arsenal - and reports from the Daily Mail suggest that Sunderland are closing in on a season-long loan deal for the 23-year-old.
With Guy Demel released, West Ham would be left without a true right back - and with the Europa League qualifiers on the horizon, that must be rectified.
A recent report from The Mirror suggested that West Ham were pursuing Lokomotiv Moscow defender Vedran Corluka as an alternative to Jenkinson; and he could be an ideal signing.
The 29-year-old not only played under Bilic for the Croatian national team, but was also signed by Bilic during his time as Lokomotiv Moscow manager.
It's clear that Bilic rates Corluka highly, and when you factor in that the player has Premier League experience having played for Manchester City and Tottenham Hotspur, Corluka becomes an enticing proposition.
Capable of playing at centre back and right back, Corluka would offer much needed versatility in defence for West Ham, and given that the defender is familiar with Bilic's methods, he could make a seamless transition to life as a Hammer - if they do indeed make a move to sign him this summer.