"Quality reinforcements" refers to reliable and skilled individuals or resources that are brought in to improve and strengthen a certain situation or team. They help enhance performance, reliability, and overall effectiveness. Full definition
We had plenty of money in the 13/14 season, top of league then as well, and badly needing quality reinforcements in January, and what did Wenger do... he signed a rubbish injured player for a position that didn't even need strengthening. (justarsenal.com)
In addition, I believe Mesut Ozil and Alexis Sanchez are both waiting to see if Wenger brings in top - quality reinforcements in the summer before they make their decision in regards to a new contract, so the potential capture of the Belgian will serve as a statement of intent to our star duo as well. (justarsenal.com)