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A bad start to the season for Buccaneers quarterback Josh McCown is getting worse.

The thumb injury McCown suffered in Thursday night’s loss in Atlanta is likely to force McCown to miss “several weeks,” a source told Alex Marvez of FOX Sports.

That would mean Mike Glennon, the 2013 third-round pick who became the starter during his rookie year, will start. Glennon showed some promise during his rookie season, but the new regime in Tampa obviously didn’t think he was ready to start, because the Bucs gave McCown a two-year, $10 million contract this offseason to become the starter.

Unfortunately, McCown hasn’t done much with the starting job: After throwing just one interception in 224 passes last season, McCown has thrown four interceptions in just 68 passes this season. Although Bucs coach Lovie Smith has insisted that McCown is the starter when healthy, Glennon will get an opportunity to show he deserves to keep the starting job.