Frank is convinced that he will have a chance to keep Christian Eriksen at the club beyond this summer.
He joined the Bees on a six-month deal.
The Danes have lost one game in the eight games they have started.
Frank told Thursday's news conference that he picked up the phone and asked if he wanted to come to Brentford.
No one thought about that six months ago. I would love to say that he is 100 per cent, but I think there is a good chance he can wear the shirt.
Frank says it is a win-win situation for the Danes as they are linked with several clubs.
Either he signs with us and everyone is going to be happy, or the fans will build a statue of him outside the stadium in two or three years, or he goes to a bigger level and fans will applaud him.
After collapsing while playing for the Danes at the Euro 2020 tournament, he resumed his playing career.
He has been fitted with an implanted cardioverter-defibrillator (ICD), a type of pacemaker, after suffering cardiac arrest and has been arguably Brentford's stand-out player in the matches he has played.
Frank said that he helped the team, gave something to the fans they had never seen before, and we helped him back to his football life again.
The 11th-ranked team in the league will play their final game of the season on Sunday against the 19th-ranked team.
Frank refused to be drawn into the idea that the game gives his side a chance for revenge for a video taunting him.
Stuart Dallas and Liam Cooper were filmed chanting "mind the gap, Thomas Frank" during the promotion celebrations in 2020.
Frank had suggested that the second tier side would fear facing his side at their ground.
Frank said that he didn't know why the video came. I think the only thing I said before the game was that they would probably be scared to come to the park because we were in good shape. The only thing was that.
Maybe I shouldn't have said that. People think I do mind games. I am just honest. I'm just saying what I see.