Sunderland are keen to bring in Mo Eisa, as they look to improve their attacking options.
Sunderland are after the Cheltenham forward, who smashed in goals regularly in League Two last season.
However, the Black Cats face a fight for the prolific forward from some of their divisional rivals.
Both Peterborough and Pompey are said to be keen on Eisa, but it is Sunderland who have made the highest bid.
Sunderland are now aiming to get a deal over the line for Eisa sooner rather than later, as Jack Ross looks to strengthen his attacking options.
The Black Cats have already brought in Chris Maguire, but are aiming for at least another two striking additions before the campaign starts.
Sunderland begin their League One season with a match against Charlton Athletic in August.
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