Sunderland are hoping to seal a triple transfer swoop this week after lodging bids for several players.
Top of the agenda for owner Stewart Donald and manager Jack Ross is reinforcing the Black Cats squad ahead of the new League One season.
And having already signed six players without spending a penny, Donald has now ramped up the transfer activity.
Sunderland have made a £1million-plus bid for Cheltenham striker Mo Eisa, and have upped their offer for Bradford City frontman Charlie Wyke to around £600,000.
And with a bid having been accepted for Reading midfielder George Evans, the Black Cats could take their spending to more than £2million in the next few days.
Eisa is a highly-rated striker who scored 25 goals for Cheltenham in League Two last season.
The Sudan-born 24-year-old is also attracting attention from Portsmouth and Peterborough. The former are believed to have already had two bids turned down for a player Cheltenham value at around £1.5million.
Championship sides are also believed to be keeping tabs on Eisa, while Sunderland also face competition for Wyke, with Bolton Wanderers keen on the player.
However, Sunderland remain in pole position to sign the ex-Middlesbrough man, with Wyke believed to favour a return to the North East.
Meanwhile, Sunderland hope to make progress on Evans' transfer with the player expected on Wearside for talks and a medical.