The Vikings preseason schedule includes games at the Metrodome against Houston and Tennessee, and a nationally televised game at San Francisco.

Exact dates and times for three of the games will be released at a later date, but the opponents were announced today by the NFL.

The only date set is the game against the 49ers, which will be Sunday, Aug. 25. That contest will be televised by NBC (Ch. 11) at 7 p.m.

The game against Houston at the Metrodome will be either Aug. 8, 9 or 10; the following week the Vikings will play at Buffalo on either Aug. 15, 16 or 17; and they will close out the preseason at the Metrodome against Tennessee on either Aug. 29 or 30.

The Vikings played Houston and San Francisco last year in both the preseason and the regular season.

The Texans and 49ers won the preseason contests by scores of 28-24 and 17-6, respectively. But the Vikings bounced back to defeat both teams during the regular season, delivering convincing defeats. They beat San Francisco 24-13 in Week 3 and hammered Houston 23-6 13 weeks later.