Alex Neil aims to get to the bottom of Norwich City's early season injury jinx.

Ivo Pinto underwent tests on Monday to assess the extent of the hamstring problem that forced him out of Sunday's 1-1 Championship derby at Ipswich, joining a growing casualty list.

Injured quartet John Ruddy, Martin Olsson, Graham Dorrans and Alex Pritchard are again unavailable for Tuesday's League Cup tie, with Matt Jarvis a longer term absentee following summer knee surgery.

'Last year we had the best injury rate in the Premier League. We had five soft tissue injuries over the course of the season whereas we have had four so far,' said Neil. 'It is something we need to look at but I want to break it down and look at things individually because some of them have no correlation. We have six injuries, which is not ideal, but we are managing to cope with it. There will be a bunch of them training in the next day or two so provided they get through this week okay we will see (about Birmingham). I certainly wouldn't rule them out yet for the weekend.'

Neil will have a clearer idea of Pinto's layoff when he gets the results of those medical scans.

'Ivo just tweaked his hamstring and actually felt it in the warm-up,' he said. 'He over-stretched for a ball and we were hoping he would be fine. He started the game, no issues, and unfortunately as the game wore on it got worse and we had to obviously take him off, but we have got cover. Steven Whittaker came on and arguably had the two best chances in the game in the second half. Steven is more than able to come in and do a really good job.'