Philadelphia Eagles receiver Jeremy Maclin, who hasn't participated in training camp because of an undisclosed illness, will undergo more tests in his hometown of St. Louis, a team spokesman confirmed Thursday.

Maclin reportedly contracted mononucleosis in the spring, but is is unclear if his current illness is related to that. He recently tried to shoot down reports that he's suffering from a career-threatening condition.

"Those crazy reports aren't true," he told reporters last Saturday.

Coach Andy Reid said last week that he was optimistic that Maclin would be ready for the start of the season.

The 23-year-old Maclin caught 70 passes for 964 yards last season. His 10 touchdown receptions tied for seventh in the NFL.

On Wednesday, the Eagles agreed to a one-year deal with former New York Giants receiver Steve Smith, who is recovering from a knee injury, on Wednesday. Smith played for the Giants from 2007 to 2010, totaling 220 receptions for 2,386 yards and 11 touchdowns. Smith made the Pro Bowl in 2009, when he posted a franchise-record 107 receptions for 1,220 yards and seven touchdowns.

Sources with knowledge of Smith's medical review by the Giants and Eagles told ESPN senior NFL analyst Chris Mortensen that doctors realistically believe the receiver could return by mid-October if he suffers no setbacks in his rehabilitation.