'Sell to buy' has been the rhetoric coming out of Carrow Road when talking about the January transfer window.

After Swansea City completed a deal for Martin Olsson, City fans will demand action given the dearth of options the club now has at left back.

City have pocketed an 'undisclosed fee' for the 28-year-old but, if reports are to be believed, City's coffers have been boosted by around £4m.

The chant goes 'rhythm is a dancer, Whittaker's the answer' but you won't find too many City fans who genuinely believe this to be the case.

Steven Whittaker can 'fill in' at left back but if City were to use him there for the rest of the season you really would have to query how serious they are about a return to the top-flight at the first attempt.

Yes, Robbie Brady can play at left back but a) it's not his best position and b) he seems likely to be the next player out the City exit door. Harry Toffolo was deemed surplus to requirements, for now at least, when the youngster signed for Scunthorpe United on loan for the rest of the season.

Olsson had his flaws, particularly defensively, but there weren't many better left backs in the Championship.

His absence will be keenly felt and fresh blood is needed...quickly. City boss Alex Neil and the recruitment panel must know they have to act although only a select few know what kind of budget there is to replace the Swede.

The fact Olsson has been prepared to swap Carrow Road for the Liberty Stadium is a damning indictment of how Norwich's season has panned out.

If City had been flying high, in the thick of the automatic promotion race, Olsson may have been willing to stick it out in Norfolk in the hope of a quick top-flight return.

He's decided to jump ship and we will only know in around five months' time if it was a good decision. Judging by the way Swansea were dismantled by Arsenal at the weekend, new boss Paul Clement has plenty of work to do and it is by no means a given that they will be in the Premier League next season.

Olsson has rolled the dice and Norwich must now do the same in the search for his replacement.