Birmingham City's injury-ravaged midfielder David Dunn will miss the last three games of the season according to Blues boss Steve Bruce.The 26-year-old was forced out of the 3-1 derby reverse at Aston Villa by a calf injury just 17 minutes into the game and Bruce admits that Dunn's seemingly eternal problems are set to continue.He said: "I can't see David playing again this season. You feel sorry for the lad."When you've only played something like two 90 minutes in two years it does become very difficult."There comes a time when whatever you say or do can't help the kid. He is a devastated footballer who just wants to play. He will need to be tough."Dunn has made just eight league starts this season after recovering from surgery on a serious back complaint, but he has subsequently suffered with thigh and hamstring problems.