Manchester United are monitoring both Lewis Hall and Antonee Robinson as possible options at left-back. The club is looking to reinforce their options at left-back, with Luke Shaw being the only senior left-back at Old Trafford. With Tyrell Malacia leaving the club this summer and Patrick Dorgu expected to continue in a more attacking position under Michael Carrick, that just leaves Luke Shaw as the only senior left-back at the club going into next season. Diogo Dalot and Noussair Mazraoui are able to deputise in the position if required but with Champions League football to look forward to, the club will look to strengthen in that position. As Sky Sports News reported in March, Newcastle United's Lewis Hall is a player United continue to monitor and could look to act on if the opportunity arises. Hall missed out on Thomas Tuchel's World Cup squad and with United needing to future-proof their left-back position with Shaw out of contract next summer, he could be a potential option. Newcastle however, would be expected to demand a significant fee for a player they signed for £28m from Chelsea two years ago. Fulham's Antonee Robinson is another option for United that has emerged as a potential target at left-back. The USA international is expected to attract interest once again this summer but it remains to be seen with a new head coach arriving at Craven Cottage whether Robinson is likely to leave the club. Young left-back Harry Amass could also play a role if he impresses in pre-season. Amass had a strong first-half of the season for Sheffield Wednesday before his season was cut short after picking up an injury at Norwich in January. He is expected to be with Manchester United's first-team during pre-season having fully recovered and Sky Sports News understands that all options over the 19-year-old's future are on the table. A back-up goalkeeper is also on the agenda for Manchester in this window. With Andre Onana having returned from his loan at Trabzonspor, he is not expected to have a chance to compete for the No 1 jersey in pre-season and his future is very much seen away from Old Trafford. Turkish keeper Altay Bayindir is also another likely departure as the club will look at potential options to support Senne Lammens after an impressive debut season in goal. A potential option to back-up Lammens is not expected to include returning keeper Radek Vitek. Czech Republic age-group international Vitek had a successful loan spell at Bristol City last season but is expected to continue his career elsewhere as United are set to cash-in on the 22-year-old.