The 22-year-old expressed his wish to move on three weeks ago with him essentially being fifth-choice in the pecking order for half-back spots at the KCOM Stadium.
But Abdull - who still has a year to run on his present contract - has started regularly of late due to injuries to Albert Kelly, Marc Sneyd and Jake Connor.
Asked if he was disappointed with the timing of his request - Hull are on a seven-game losing sequence with four Super 8s matches remaining - Radford admitted: “Yeah, it’s crazy. I honestly thought he must have had something lined up. But at this minute it’s not transpiring anything is lined up.
“Could it have waited six weeks? Definitely. He’s a young boy. He makes his own decisions. I don’t know who is in his ear.”
Hull will expect a transfer fee for the homegrown player who spent last season on loan at Hull KR helping them out of the Championship.
Radford, who says Abdull will miss tomorrow night’s game against Castleford Tigers with a hip injury, considered leaving him out last week for the record 80-10 defeat at Warrington Wolves.
“I’d have loved to but I didn’t have anyone to leave him out for,” he added. “There was part of me that thought he would really rip in and put himself in the shop window. I was hanging on to that hope.
“Rightly or wrongly, he’s fifth choice half at Hull. We’re very lucky, we’ve got a lot of halves. Three of my best are all out of the team at the minute.
“Maybe he wants to go somewhere he’s higher up the pecking order. I would. Everyone has got that option to leave if you’re not happy.”
Radford says he is down to his last fit 17 players tomorrow with youngster Cameron Scott due to play as England Knights centre Josh Griffin also drops out injured along with Abdull.