Frank hasn't given up on keeping his fellow Dane for a little longer.
He said after Sunday's 3-2 win at Everton: "There is still more to come from him.
"Maybe not 10 top crosses a game, but more sharpness in the big moments. He's at a good level now but the last bit will take some time.
"For me [signing Eriksen] was not a gamble. I was convinced he could help us and that he could be the best signing ever for Brentford.
"It was not an injury, it was a heart condition. So he wouldn't have lost any speed or anything. There's a mental issue but when he decided he wanted to play that was it."
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!