The Football Association will look into Gary Neville's apparent one-fingered gesture that took place in Manchester United's 2-1 loss to Manchester City.The United substitute was warming up on the touchline when City's Carlos Tevez celebrated scoring a penalty that made it 1-1 in the Carling Cup semi-final.
Cameras caught defender Neville appearing to make a gesture in return.
The FA confirmed it will scrutinise the first-leg footage before deciding whether any further action is required.
In September, Neville was cautioned about his future conduct following United's dramatic 4-3 derby win in the Premier League when he ran towards City fans to celebrate Michael Owen's injury-time winner at Old Trafford.
The England defender received a £5,000 FA fine and was warned over his future conduct in 2006 because he celebrated in front of Liverpool's fans after United secured a late winner over their rivals.
Argentine Tevez joined City in July 2009 following an extended, two-season loan deal with United, with whom he won two Premier League titles and the Champions League.
His move to bitter rivals City angered United fans as Tevez was a firm favourite with Old Trafford supporters.
Source: BBC Sport
Source: BBC Sport