Sunderland submitted a bid of over £1million for the 24-year-old striker who the Black Cats have targeted to add firepower to their attack.
However, he revealed Cheltenham are yet to respond - despite numerous follow-up calls.
Sunderland also have bids in for Charlie Wyke and Reading midfielder George Evans as Donald admits he's getting "itchy" as he tries to boost Jack Ross' resources ahead of the new season.
But former Eastleigh chief Donald told the Roker Report today he is hopeful Cheltenham will accept the move for Sudan-born Eisa.
Asked about Sunderland's bid for Eisa, Donald said: "They (Cheltenham) have not come back to us but that bid is strong".
'I think we have chased them 20 times. I think it's a fantastic bid for the player.
While the Black Cats' bid has reportedly fallen below the Bantams' valuation, the Yorkshire side are hoping for a quick resolution. It's a proper bid. "I see people saying we should be in for Jack Marriott but he's £6.5million apparently quoted and that's out of our ball park". It would be a budget some teams in the Championship would love and that's a fact. That's what we will have.
The 29-year-old's pre-season performances are not the only things that perhaps sway Ross to choosing Maguire as one of the first names on his team sheet, with the forward also having a lot of experience of the lower leagues; something that is imperative in order for Sunderland to succeed next season. It's unknown what he thought of both players watching the match but it could indicate a more concrete move for one of the players may happen soon. New head coach Jack Ross is targeting an immediate return to the second tier, something every relegated side was able to do past year.