ALLEN PARK — First-round pick Ndamukong Suh was on the Lions practice field for the first time in this afternoon’s opening rookie minicamp session. Even though we’ve seen game clips and know his size, he is an impressive looking tackle. Your eye is drawn to No. 90 on the field.

CB Amari Spievey, the third-round pick, experienced tightness in hip flexors during warm-ups so the decision was made to shut him down.

“He’s probably day to day,’’ coach Jim Schwartz said, adding that he’d like to get him on the field Saturday or Sunday. ‘One thing we don’t want to do is take something that’s minor and turn it into something worse.’’

T Jason Fox, the fourth-round pick who is coming off knee surgery, participated in individual drills only.

“We knew where he was in his rehab and we were comfortable. The one thing we wanted to

Minicamp sessions continue on Saturday and Sunday.

More on Friday’s workout later ...