From Fantistics.com 6/16:
Rolen's hurt neck is becoming a little concerning now. After three days, he is still suffering from a very stiff neck, and is unable to turn the neck freely. In fact, he winces when he coughs. He started yesterday's game, but was removed in the 6th inning when La Russa didn't think Rolen ought to be playing any more. While Rolen might well battle through this, it will take longer to heal, so expect a good dose of 2or 3 AB games for at least a week.