The left-back has been linked with Celtic and Aberdeen but Archibald expects him to move further afield when his contract expires after today's game against Ross County.
Thistle will miss out on compensation as the age limit is 23 for cross-border moves rather than 24 for internal transfers, but Archibald will remain grateful for the defender's contribution.
"I think Aaron's going to go," he said. "He has said that all along. He's been a credit to himself, his family and the club in the way he has carried out his business on the pitch.
"He's stated that he wants to go and play down south. We wish him all the best, he's a true professional."
Taylor-Sinclair can at least bid a memorable farewell to Firhill as Thistle attempt to stay in seventh place, and with £90,000 on offer per finishing place, Archibald feels this could be crucial to next season's prospects.
"It makes a massive difference. The chairman has already said that any more money we get will go right back into the player budget. So it can only help us to move forward," he said.
Similarly, Filip Kiss would love to repay Ross County for a recuperative spell in the Highlands with the financial riches of finishing seventh.
A loan spell in Dingwall brought the Slovak out of cold storage at Cardiff City - and into his national squad. But while Kiss has two years remaining on his contract, he is refusing to rule out a return to County sometime in the future.
Kiss said: "We have one more game to go and it will be nice to go into it without the pressure of relegation. I'm intrigued to see how well we can play without that hanging over us anymore. There is seventh place to play for and that would bring a good reward for the club."