Probably unsy would be able to tell Koeman which is the better option in his opinion for each of them? Believe browning is currently training with first team and Pennington with u23s. Koeman has probably not seen either play a match in person. Browning is near the end of his contract too, so there is a decision to be made, most likely. Sounds like believable info to me...You've been told that the u23 manager has been asked to work with some u23 players and consider if they might be ready to play in the first team or go on loan.
Can I ask what you thought he might be doing other than this?