They were the first two players back after the summer internationals, with Wales having exited Euro 2020 at the last-16 stage at the hands of Denmark.
Jota’s Portugal were also knocked out of the last 16, suffering a 1-0 defeat to Belgium, and after a three-week break the forward will rejoin his team-mates in Austria on Wednesday.
His return follows the opening friendlies against FC Wacker Innsbruck and Stuttgart, which Jurgen Klopp has predicted “could be a bit chaotic or could be a bit wild.”
The 24-year-old will then be put through initial tests ahead of ball work with the rest of the squad, who are still without seven other players due to their involvement at Euro 2020 and Copa America.
Robertson, though, was the first to see his international duty end but, despite this, is still not with the Liverpool squad under the Alps.
The left-back is still on holiday with his family, having been granted a longer time off than his fellow internationals after a gruelling campaign for club and country.
No Liverpool player clocked more minutes on the pitch than Robertson last season, with the three other outfielders in the top five having been afforded a long holiday due to a lack of action for their national teams.
Alexander-Arnold was, of course, rehabbing a quad injury that forced him out of the England squad, but the right-back was still able to leave the UK on holiday as a mental break.
It is likely that Robertson, who marks the end of his fourth week off on Wednesday, will report back for pre-season training later this week.