Pennington is dealing with flu-like symptoms, Maria Guardado of MLB.com reports.
It's unknown whether the illness has set him back at all in spring training, but it's likely nothing too serious at this point. Pennington hit just .209 in 74 games with the Angels last season and is likely to serve as a reserve infielder this season behind Andrelton Simmons and Danny Espinosa. Consider him day-to-day for now.