This was a well balanced game and Newcastle certainly had their chances to win it, but a late error by 22 year-old Spaniard Jose Enrique let in Stuart Elliott, who made no mistake and shot past a helpless Tim Krul to give Doncaster the win.
But Newcastle should probably have had the game wrapped up by then and only poor finishing from Shola Ameobi cost Newcastle a couple of goals.
Danny Guthrie again looked good in central midfield for Newcastle and Sebastien Bassong looked sound at the back in his first appearance for the team.
Seb is on trial with Newcastle from French side Metz, who were relegated last season from the French First Division.
Stuart Elliott – scored Doncaster’s winner on 87 minutes
Newcastle had goalkeeper Steve Harper to thank for keeping the scores level at half time, after he made a magnificent finger-tipped save from Gareth Taylor’s header, which appeared though it was a goal, before the goalkeeper amazingly clawed the ball away after 35 minutes.
Charles N’Zogbia looked menacing at times, and made some of his surges from midfield but was a little wild in his final show otherwise he could have scores a couple for the Magpies.
Tim Krul,Â David Edgar and Ben Tozer all made substitute appearances in the second half for Steve Harper,Â Claudio Cacapa and Geremi.
An even game overall and Keegan will have learned more about his players from this game, which is really what these pre-season games are all about.
New signing Danny Guthrie continues to look the part for Newcastle, and 22 year old Seb Bassong looked more than adequate in the center of the Magpies defense.
But Newcastle were nowhere near as good as they were last week, and this has to be a rather disappointing performance for both the fans and the manager.
Doncaster Rovers: Neil Sullivan; Robbie Hall, Trialist, Trialist, Gareth Roberts; James Coppinger, Richie Wellens, James Hayter, Martin Woods; Gareth Taylor, Lewis Guy,
Subs: James O’Connor, Adam Lockwood, Mark Wilson, Stuart Elliott, Paul Heffernan, Craig Nelthorpe,John Spicer;
Newcastle United:Steve Harper, Steven Taylor, Claudio Cacapa, Sebastien Bassong, Jose Enrique, Damien Duff, Danny Guthrie, Geremi (c), Charles N’Zogbia, Shola Ameobi, Alan Smith
Subs: David Edgar, Frank Wiafe Danquah, Ben Tozer, Callum Morris, Tim Krul, Mark Doninger, Ryan Donaldson, Jonny Godsmark