ESPN.com With a Marcus Mariota return looking more likely than it did last week, can the Titans put themselves back in the mix for the AFC South crown? Here's a guide to everything you need to know about the Indianapolis Colts-Tennessee Titans matchup. Monday, 8:30 p.m. ET on ESPN & WatchESPN Game HQ page | PickCenter Marcus Mariota officially listed as questionable for MNF vs. Colts. Titans will likely let decision linger until before gametime. Tight end Jack Doyle has cleared the concussion protocol and will return against the Titans on Monday.