EDEN PRAIRIE, Minn. -- The Minnesota Vikings brought in two defensive tackles for tryouts on Tuesday, in a sign they could be concerned about their depth at the position with nose tackle Linval Joseph still out with a foot injury.

Former Cleveland Browns nose tackle Phil Taylor worked out for the Vikings on Tuesday, after the Browns released him in September following his rehab from a knee injury. The 21st overall pick in the 2011 draft, Taylor had four sacks as a rookie for the Browns, but struggled with injuries and never made a major impact after that.

The Vikings also brought in former CFL defensive tackle Euclid Cummings and appeared to have several other players in for tryouts on Tuesday. Cummings' tryout went well, according to a league source, but the process of signing him could take weeks, not days. He is still under contract with the Toronto Argonauts, and CFL teams typically are reluctant to release players from their contracts until the winter, for fear of losing them to other CFL teams. The Vikings are among the more aggressive teams scouting the CFL, but if they were to have interest in approaching Cummings' agent, Johnathon Hardaway, with a contract offer for the Georgia Tech product, they'd be hard-pressed to get his deal done this week. Cummings has workouts scheduled with eight or nine teams, according to the source, so it's possible the Vikings could circle back to him in the offseason, as well.

In any case, the fact the Vikings are looking at depth for the middle of their defensive line could reflect the possibility that Joseph will miss more time after being out for both of the Vikings' games last week.

The nose tackle's injury initially was not thought to be serious, but he hasn't practiced the last two weeks. The Vikings have been short on defensive tackle depth since Shamar Stephen went on injured reserve, and it's common for NFL teams to work out players on Tuesdays, but it's worth monitoring the situation, given what Joseph has meant to the Vikings' defensive line and the fact they've allowed 270 rushing yards in their last two games without Joseph.