Ritchie – who withdrew from the Scotland squad through injury over the weekend – was back with the rest of the squad on Tyneside today after being assessed by the club's medical staff.
The winger played 87 minutes of Scotland's 1-0 friendly defeat by Costa Rica on Friday night, but headed back to the North East before Tuesday night's 1-0 win in Hungary.
Ritchie alone with the the club's fitness coach yesterday, but was given the green light to join the rest of the group this morning.
The 28-year-old – who has scored in two of his last three games for Newcastle – including a winner against Manchester United, is a key member of Benitez's team and his availability this weekend will delight Benitez.
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Benitez's team currently sits in 13th place in the table on 32 points, but just four points clear of the drop zone with eight games remaining.
Victory over Huddersfield – who are two places and a single point worse off – would edge them closer to Benitez's 40-point target for the season and significantly boost their chances of remaining in the top flight.