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Darwin Nunez and Harvey Elliott also scored in an impressive display from Liverpool, while Slot was able to welcome back one of his injured players in the pre-season encounter.
Jayden Danns last played for Liverpool on January 29 - 187 days ago - and an injury-ravaged second half of the campaign denied the attacker the chance to make a single appearance for Sunderland after joining on loan.
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He suffered a stress fracture in his lower back, a problem which was noticed during his medical ahead of the loan, and Liverpool took a cautious approach to his recovery.
Danns has been around the first-team group in recent weeks and was seen training with the group, but wasn't involved in any of the first four pre-season matches of the summer.
That changed at Anfield on Monday after the 19-year-old came on in the 56th minute of the 4-1 win.
Danns looked sharp on his return to the first team
He played in the wide areas, starting on the right and then moving over to the left, with Nunez occupying the no.9 role.
Danns looked sharp, with several quick turns of pace and some good link-up with his Liverpool team-mates
Danns' physicality was also noticeable and he has clearly bulked up during his injury absence.
While Monday was his return to the first team, he has already been involved with the Under-21s this summer, and played in the victory over Lens last week.
The teenager is well thought of by Slot, who namechecked Danns in January when listing his attacking options.
At this stage of the summer, an exit is not expected, even on loan, although that could change with the arrival of Isak