Samuel has not played for Coyle's side since a pre-season friendly with Osasuna in August due to a ruptured thigh. But the former Aston Villa left-back is now firmly on the road to full fitness after playing the full 90 minutes of Bolton's 3-2 reserve team victory over Manchester City this week.
"Jlloyd did very well to come back and play through the reserve game given he had been out for months," said Coyle. "He's back training with the group, but he's only had one reserve game, so he's certainly not in contention to face Newcastle (on Saturday)."
He added: "However, he is progressing, which is great because he's a terrific lad as well as a top player.
"We hope that with another couple of reserve games then he'll be right back in the mix.
"That will be great because the loss of Zat Knight (knee) and Sam Ricketts (Achilles), who have been hugely influential as part of our group this season, were big blows."
Coyle has also confirmed another defender in Gretar Steinsson, who has been out for a month with a knee injury, may come into contention for the trip to St James' Park.