The striker scored in his side's clash with Watford on Saturday.
The Sunderland striker has scored 14 goals this season.
The Austrian and the South Korean both arrived from Bundesliga football.
Rangers lost 3-2 to Falkirk away from home in the Scottish Championship on Friday evening.
The Sunderland legend is hopeful the newbies will perform.
Former Everton midfielder Don Hutchison took to social media this afternoon to have his say on the Toffees' 2-0 defeat to Arsenal in the Premier League.
The Leeds head coach has been reacting to his side's 4-1 loss to Huddersfield.
The striker has been out of action for 13 months.
The Leeds United boss has turned things around brilliantly at Elland Road.
West Ham United played out a 1-1 draw with Manchester United in the FA Cup last weekend.
Jefferies reported a fiscal first-quarter loss as revenue from trading stocks and bonds tumbled 82%, leaving CEO Richard Handler vowing to do better.
Four dogs became seriously ill with at least one dying in first UK babesiosis outbreak as experts blame relaxation of pet travel rules
Tottenham boss Mauricio Pochettino hopes to have both players available.