No. 5 Johns Hopkins may welcome No. 14 Princeton to Homewood Field on Friday night without the services of Rob Guida.

The junior midfielder has been hampered by an unspecified injury that prevented him from playing in the team’s 17-8 rout of Michigan last Saturday, and his availability for Friday’s contest is unclear.

“Rob’s going to be a week-to-week, day-to-day kind of thing,” coach Dave Pietramala said.

For the past three seasons, Guida has run on the first midfield with seniors John Ranagan and John Greeley. Last year, he was that unit’s top playmaker with 17 goals and 11 assists.

But Pietramala said he did not think that Guida’s absence would impact the starting midfield.

“The good thing is, we’ve mixed and matched in the midfield not based off of intent, but more based off of necessity,” he said. “When guys get caught on the field for an extended period of time, with the new rules, you’re finding that your middies get caught a little more, and we’ve had to use our second midfield more significantly. We’ve had to bump a guy up from the second midfield to the first to take a run or two because someone got caught. So we’ve been forced to mix and match. So it’s not something we’re unaccustomed to or uncomfortable with.”

Junior Rex Sanders, who started in Guida’s place last Saturday, scored two goals against the Wolverines. Pietramala said Sanders, who has scored five times this season, will start against the Tigers.

“You’d like to upset the apple cart as little as possible, and Rex has done that,” Pietramala said. “I think he’s fit in well. He gives you a guy that can get to the goal. He’s shown that he can score with both hands. So if you can put a guy in for another player and not feel like you’ve got to change things, then that’s a positive, and with Rex there, nothing is off the table. We’re able to continue to run the same things that we would have run if Rob was there.”

Sophomore attackman Wells Stanwick and sophomore defenseman Rob Enright were among a group of players who sat out Saturday’s contest for violating a team policy.

“We had several guys violate a team policy and sat for a game,” Pietramala said. They will play this weekend.”