Despite Kieran Tierney nailing down the left-back spot at Celtic Park over the past four years, the Hoops remain in the hunt for a new full back to challenge the Scottish international.
The club have been interested in Milad Mohammadi over the past two transfer windows, and look set to go in for the Iran international once again in the summer.
The Akhmat Grozny left-back is out of contract at the end of the season and could possibly make the move to Scotland on a free transfer.
However, according to Football Insider, Fulham and Bristol City are thought to be monitoring the defender themselves ahead of a possible move.
The Cottagers are planning for life in the Championship and could lose teenage sensation Ryan Sessegnon, while the Robins may be without Lloyd Kelly next season.
Mohammadi has earned 25 senior caps for his country to date, turning out in last year’s World Cup, so would provide the Hoops with serious left-back competition if they can secure his services.
Five more left-backs Celtic could sign
Leeds’ Douglas has fallen out of favour under Marcelo Bielsa in the second half of the campaign and could be interested in a return to Scotland in the summer.
Despite scoring his first Southampton senior goal last weekend, Targett has struggled to nail down a regular spot under Ralph Hasenhuttl. The 23-year-old could be a realistic loan option for Celtic.
Experienced Spaniard Monreal is out of contract at the Emirates in the summer, however, the left-back’s wage could be a problem in any potential deal.
The 21-year-old has impressed with Brentford this season and would bring bags of pace to the left side.
The versatile Italian looks set to leave Old Trafford this summer. He could be a good signing for Celtic and would be capable of playing on either the left or right side.