Letestu signed a deal for a professional tryout with the Panthers on Tuesday.
Letestu scored a goal in the first period of Monday's 5-1 win over the Capitals.
Letestu (not injury related) will be in the lineup Monday against the Capitals, George Richards of the Columbus Dispatch reports.
Letestu is hoping to finalize his work visa ahead of Monday's matchup with Washington, Tom Gulitti of NHL.com reports.
Letestu was traded Sunday from Edmonton to Nashville in exchange for Pontus Aberg, and then traded from Nashville to Columbus for a 2018 fourth-round draft pick.
Letestu will be a healthy scratch for Thursday contest against the Flames, Jack Michaels of the Oilers Radio Network reports.
Letestu scored a short-handed goal and added an assist during Tuesday's 7-2 rout over the Blue Jackets.
Letestu scored the Oilers' eighth goal of the night on the power play and earlier had an assist in a blowout win over the Golden Knights.
Letestu secured the 2-1 overtime victory over Chicago with a big power-play slap shot on Thursday.
Letestu netted a pair of goals and added two assists in Sunday's Game 6 win over the Ducks.