Changes to the bowling attack have been mooted, with suggestions that Tim Bresnan could return to support the seamers or Monty Panesar coming in as a second spin option.
"We are clear in our own mind," Cook said of the changes. "It's a tough position to fill with Trotty playing 49 games ... he was outstanding for us at No. 3 and he gave a lot of amazing contributions, so someone will have to stand up and fill that role."
While Cook wouldn't proffer a lineup, Clarke had a few recommendations.