Tena is out of the lineup for Wednesday's game against the Pirates.
Tena has started in just one of the Nationals' last six games, sitting on three occasions against left-handed starters and twice against righties. The 25-year-old has posted a modest .665 OPS over 28 plate appearances on the season and may have to settle for more of a part-time role if Washington elects to open up playing time for Jorbit Vivas (.814 OPS in 40 plate appearances).