The Eagles are yet to concede a Premier League goal with the Liverpool loanee in the starting XI.
Crystal Palace's Mamadou Sakho in action
Mamadou Sakho may finally be realising his potential in the Premier League, although perhaps not in the way he had anticipated.
Cut adrift at parent club Liverpool for his apparent indiscipline, Sakho was finally given a chance to take to the field in 2016/17 when the Reds agreed to a loan switch to Crystal Palace.
With the Eagles having kept just one clean-sheet in six Premier League games since Sam Allardyce was appointed manager on December 23, the defensive tactician decided reinforcement was needed in the January transfer window.
Since Sakho was introduced into the Palace starting XI for a 1-0 victory over Middlesbrough on February 25 the South London side have not conceded a goal, also beating West Bromwich Albion and Watford to move four points clear of the relegation zone.
Middlesbrough's Alvaro Negredo in action with Crystal Palace's Mamadou Sakho
This defensive foundation is classic Allardyce and has seen the Eagles step away from the erratic behaviour under Alan Pardew that saw them score four times at Swansea City earlier in the season but still lose.
As for Sakho, it remains to be seen whether his form will earn him a second chance at Anfield, but those that questioned his credibility at the back are certainly being given something to think about.