Parrot joined Millwall on a season-long loan deal this summer and he will have been hoping to feature in the Lions’ season-opener against Stoke City on Saturday.
But Parrott will miss out due to a quad injury and his wait will go on.
The 18-year-old recently missed out on Republic of Ireland’s Nations League fixtures due to the same injury, which he picked up in a pre-season game for Millwall.
Parrott travelled with the Ireland squad, hoping to recover in time to make his second international appearance at senior level, but he was later ruled out.
And it seems the injury has proved more serious than first thought, now missing club action this weekend.
Milwall are next in action on Tuesday in the Carabao Cup, facing Cheltenham Town, before facing Rotherham United away the following Saturday.
Parrott will be hoping to feature in the second of those games with Tuesday’s outing likely coming a little soon given he is ruled out for this weekend.
Speaking after signing for Millwall, the youngster said: “I’m buzzing to get straight into things, I’m really looking forward to it.
“The crowd, the club itself – I’ve heard a lot of good things. When I’ve watched games, the littlest of things gets them going, and I want to be a part of something like that.
“It’s not hard to see from the outside that all [the fans] are looking for is someone to give 100% every game. When I was growing up playing football, that was the player I always was, so I feel as though I can fit it very well.
“I’m really excited to get going, work hard and give everything for the fans.”