Indianapolis Colts owner Jim Irsay has "demanded" that his side protect quarterback Andrew Luck better.

Luck was sacked four times in the Colts' opening match of the season, although last year's number one overall draft pick still helped his side to a 21-17 victory over the Oakland Raiders, running in the match-winning touchdown.

Despite winning the match, Irsay was unhappy with the lack of protection that his quarterback was given and promised an improved defensive showing when they face the Miami Dolphins this weekend.

Irsay has become notable for his outbursts on Twitter, having also slammed his side's performance in a pre-season match last month.