Threlkeld was ruled out of the 1-0 win away to Oxford United last weekend because of illness.
However, the 23-year-old took a full part in all of the sessions at the Pilgrims’ warm-weather training camp in Marbella this week.
Manager Derek Adams now has the option of playing Threlkeld at right-back and moving Zak Vyner inside to the centre of defence, although that would mean leaving out Yann Songo’o, who partnered Sonny Bradley in central defence against Oxford.
New Bradford boss Simon Grayson has been dealt a major blow with the news thatdefender Ryan McGowan has undergone knee surgery.
McGowan revealed the news on Twitter yesterday evening, writing alongside a picture of himself recovering in hospital: ‘Op done and dusted.now time for recovery and rehab 24/7 until I’m back bashing around the pitch again #NewKnee.’
Midfielder Jake Reeves continues to make progress after his groin injury but there is no timescale yet on his possible return.
Defended Tyrell Robinson will be hoping for a place in the starting XI after scoring the equaliser in the 1-1 draw with Charlton just four minutes after coming off the bench.
Burton midfielder Martin Samuelsen will use the international break to recover from illness after pulling out of Norway U21's games.
Jonas Lossl is staying 'optimistic' over Huddersfield's chances of survival this season and has urged his team-mates to 'go for it'.