Looking to impress, he started strongly with two successful penalties before injury struck and he was replaced by Simon Humberstone late in the first-half.
Humberstone himself kicked a penalty and converted Tom Youngs' try, although it was not enough to prevent Blues from slipping to a 16-21 defeat.
And while impressed with the contribution of Humberstone, McIntosh accepts they will have to address their fly-half shortage if Davies' groin injury proves to be serious.
"We don't know until we access Gareth, but it didn't look too clever to be honest with the groin," he said.
"Rhys Patchell also has a shoulder knock at the moment and is struggling a touch, so the number ten position is a little vacant for us.
"Simon Humberstone filled in well today, but we need to address that and the Board and Phil will do that and see what options we have got.
"Simon is capable of stepping up, but he is not a full-time professional. He has a job so therefore he can only get better. He works hard and has great ethics.
"There is bedding in time and, in fairness to him, he has had about three training sessions and all of a sudden he is playing 50 plus minutes of rugby."